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Time and Work eLitmus Questions, Time and work Questions for eLitmus pH Test

1

Two trains shatabdi and rajdhani with their length 450 m and 300 m coming from opposite end on two different track...shatabdis driver plans to throw wateron rajdhani's driver ...he throws water but unfortunately water felt on one of the person who was sitting in the last coach of rajdhani...what is the distance between the two tracks...speed of water was 2.5m/s..speed of shatabdi is 45m/s and rajdhani speed is 30m/s.

A.

22

B.

23

C.

24

D.

25

See Answer & Explanation Lets Discuss
Correct answer is : D
Explanation

Relative distance is =450+300 = 750m
Relative speed is 45+30 = 75 m/sec
Time = 750/75 = 10sec.
so, the distance between the tracks is 2.5*10 = 25m.

 
2

5 Women can paint a building in 30 working hours. After 16 hours work, 2 women decided to leave. How long will it take for the work to be finished.

A.

118/3

B.

118/4

C.

119/3

D.

119/4

See Answer & Explanation Lets Discuss
Correct answer is : A
Explanation

5 women paints the wall in 30 hours 
1 women will paint in 5*30=150 hours
3 women will paint in 150/3=50 hours

let total work done be x

after 16 hours work done by 5 womens will be:16x/30=8x/15
remaining work is: x-(8x/15)=7x/15
now this work has to be finished by remaining 3 womens
time taken by 3 womens  is 50 hours so 7x/15 work part will be finished by them in:
(50/x)*(7x/15)=70/3
hence the total time taken by them to finish the entire work is:
16+(70/3)=118/3

 
 

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Time and Work eLitmus Questions, Time and work Questions for eLitmus pH Test