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Lesson Posted on 23/10/2017 Exam Coaching/Bank Clerical Exam Coaching Exam Coaching/Railway Exam Tuition/Class IX-X Tuition

Average Speed

Vijaya Kumar Jayanthi

I am M.Sc and M.B.A and having more than 10 years of experience in handling CBSE, ICSE as well as state...

Average speed is total distance travelled in total time. We can calculate average only when we are given any of these two. In case, we are given only speed, then this formula is helpful. V travelled half of his journey at X kmph and the remaining half at Y kmph. What is his average speed? Average... read more

Average speed is total distance travelled in total time. We can calculate average only when we are given any of these two. 

In case, we are given only speed, then this formula is helpful.

V travelled half of his journey at X kmph and the remaining half at Y kmph. What is his average speed?

Average speed of V is = 2XY / X + Y.

Example: A travelled half of a distance is with 30Kmph and remaining half distance at 10Kmph. Then his average speed is:

2 × 30 × 10/30 + 10

= 600/40.

= 15Kmph.

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Lesson Posted on 28/04/2017 Exam Coaching/Bank Clerical Exam Coaching Exam Coaching/IBPS Exam Coaching Exam Coaching/Quantitative Aptitude +3 Exam Coaching/Railway Exam Exam Coaching/SBI Exam Exam Coaching/Government Exams Coaching/Staff Selection Commission Exam less

Find out the wrong number in the following number series.

Saikat Mitra

I am teacher of all India competitive Examination.

Find out the wrong number in the following number series. 1. 1 5 23 91 263 521 515 2. -2 5 -1 12 29 166 9813. 15 136 55 104 79 89 4. 120 15 100 25 75 37.5 5. 24 12 12 18 27 90 2706. 17 169 972 4885 19524 58581 7. 8450 8793 9009 9135 91988. 7.5 57 295 1088 3570 71449. 456 908 2718 10864 54312 32584810.... read more

Find out the wrong number in the following number series.


1. 1 5 23 91 263 521 515 
2. -2 5 -1 12 29 166 981
3. 15 136 55 104 79 89 
4. 120 15 100 25 75 37.5 
5. 24 12 12 18 27 90 270
6. 17 169 972 4885 19524 58581 
7. 8450 8793 9009 9135 9198
8. 7.5 57 295 1088 3570 7144
9. 456 908 2718 10864 54312 325848
10. 2.3 15.9 79.8 423 2574 18067 
11. 10 12.5 27.5 85 342.5 1725 10292.5 
12. 5 4 7.5 19 45 138
13. 18432 9216 2304 384 50 4.8 0.4
14. 68 72 76 88 108 138 180
15. 1 2 4.5 11 30 92.5 329 
16. 2 5 7 12 19 32 50 
17. 2 13 65 271 817 1639 1645
18. 3 4 16 75 366 1945 
19. 2 14 91 546 3002 15015 
20. 484 240 120 57 26.5 11.25 
21.3 5 13 43 178 891 5353 
22.6 7 16 41 90 154 292 
23. 5 7 16 57 244 1245 7506 
24. 4 2.5 3.5 6.5 15.5 41.25 126.75
25. 5 366 655 881 1049 1170 
26. 17 45 148 607 3054 18331 
27. 3 8 36 204 1421 11360 
28. 17 169 972 4885 19524 58581 
24. 8450 8793 9009 9135 9198 
25.7.5 57 295 1088 3570 7144 
26. 2.3 15.9 79.8 423 2574 18067
27. 12 25 77 321 1559 9359 
28.11 20 77 309 1380 7125 
29.19 10667 10139 23962 23337
30. 156 92 101 93 113 94
31.68921 1764 79507 1936 91125 2117

 

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Answered on 30/04/2017 Exam Coaching/Railway Exam

Ankit Khariwal

Tutor

Focus on Maths and Reasoning. They are the Pillar subjects for almost every examination. Though English is important but its not compulsion for some examinations.
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Lesson Posted on 04/12/2016 Exam Coaching/Bank Clerical Exam Coaching Exam Coaching/UPSC Exams Coaching Exam Coaching/UPSC Exams Coaching/IAS (Indian Administrative Service) Coaching +2 Exam Coaching/Railway Exam Exam Coaching/Math Olympiad less

Time and Work

JR JUNIOR IAS

Our business estb. in 2012 found by jegan prabu m.e. from anna university. We are the first provider...

A and B complete a work in 6 days. A alone can do it in 10 days. If both together can do the work in how many days? 3.75 days 4 days 5 days 6 days Answer & Explanation Answer: Option A Explanation: 1/6 + 1/10 = 8/30 = 4/15 15/4 = 3.75 days A can do a piece of work in 4 days. B... read more
  1. A and B complete a work in 6 days. A alone can do it in 10 days. If both together can do the work in how many days?
  • 3.75 days
  • 4 days
  • 5 days
  • 6 days

Answer & Explanation

Answer: Option A

Explanation:

1/6 + 1/10 = 8/30 = 4/15

15/4 = 3.75 days

  1. A can do a piece of work in 4 days. B can do it in 5 days. With the assistance of C they completed the work in 2 days. Find in how many days can C alone do it?
  • 10 days
  • 20 days
  • 5 days
  • 4 days

Answer & Explanation

Answer: Option B

Explanation:

C = 1/2 - 1/4 - 1/5 = 1/20 => 20 days

 

1. 

In how many days can 10 women finish a work?

I. 

10 men can complete the work in 6 days.

II. 

10 men and 10 women together can complete the work in 3

3

days

7

 III. 

If 10 men work for 3 days and thereafter 10 women replace them, the remaining work in completed in 4 days.

A.

Any two of the three

B.

I and II only

C.

II and III only

D.

I and III only

E.

None of these

 

Answer: Option A

 

Explanation:

  I. (10 x 6) men can complete the work in 1 day.

       1 man's 1 day's work =

1

60


 II.

 

10 x

24

 

men +

 

10 x

24

 

women can complete the work in 1 day.

7

7

 

      

 

240

 

men's 1 day work +

 

240

 

women's 1 day work = 1.

7

7

 

      

 

240

x

1

 

+

 

240

 

women's 1 day's work = 1.

7

60

7

 

      

 

240

 

women's 1 day's work =

 

1 -

4

 

=

3

7

7

7

 

       10 women's 1 day's work =

 

3

x

7

x 10

 

=

1

7

240

8

      So, 10 women can finish the work in 8 days.


III. (10 men's work for 3 days) + (10 women's work for 4 days) = 1

       (10 x 3) men's 1 day's work + (10 x 4) women's 1 day's work = 1

       30 men's 1 day's work + 40 women's 1 day's work = 1


      Thus, I and III will give us the answer.

      And, II and III will give us the answer.

       Correct answer is (A).

 

Directions to Solve

Each of these questions is followed by three statements. You have to study the question and all the three statements given to decide whether any information provided in the statement(s) is redundant and can be dispensed with while answering the given question.

 

 

1. 

8 men and 14 women are working together in a field. After working for 3 days, 5 men and 8 women leave the work. How many more days will be required to complete the work?

I. 

19 men and 12 women together can complete the work in 18 days.

II. 

16 men can complete two-third of the work in 16 days.

 III. 

In 1 day, the work done by three men in equal to the work done by four women.

A.

I only

B.

II only

C.

III only

D.

I or II or III

E.

II or III only

Explanation:

Clearly, I only gives the answer.

Similarly, II only gives the answer.

And, III only gives the answer.

 Correct answer is (D).

 

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Answered on 02/04/2017 Exam Coaching/Railway Exam

Which Indian private firm recently got license from DRDO to manufacture Lakshya for India?s military?

Srinivas

Tutor

L&T
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Answered on 23/09/2017 Exam Coaching/Railway Exam

Aakash

1+2+......+15 = 15(15+1)/2 = 15*16/2 = 15*8 =120
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Answered on 12/10/2016 Exam Coaching/Railway Exam

What VBA stand for?

Vedanta

VBA stands for Visual Basic for Applications. It is the programming language used in MS Office, AutoCAD etc.
Answers 2 Comments
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Answered on 27/10/2016 Exam Coaching/Railway Exam

Who is the CEO of Google?

Challenge Palakkad

B.tech,diploma,plus one,plus two,S.S.L.C tuitions and let & AMIE coachings

Sundar Pichai is the CEO of Google
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Answered on 27/10/2016 Exam Coaching/Railway Exam

Define Laplace Transform?

Er.Sukhwinder Singh Bachhal

Trainer

In mathematics the Laplace transform is an integral transform named after its discoverer Pierre-Simon Laplace . It takes a function of a positive real variable t (often time) to a function of a complex variable s (frequency). The Laplace transform is very similar to the Fourier transform.
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Answered on 17/10/2016 Exam Coaching/Railway Exam

How to prepare for railway exam of 2016?

Permchand

yes
Answers 1 Comments
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