Question

A train 150 m long travels at 15 m/s. How long does it take to pass a man running at 10 m/s in the same
direction?
Select one:
a. 20 sec
b. 30 sec
C. 5 sec
d. 10 sec​

Answer 1

Answer:

b 30 sec

Step-by-step explanation:

t hope it will help you

Answer 2

Given : A train 150 m long travels at 15 m/s.

To Find : How long does it take to pa ss a man running at 10 m/s in the same direction

a. 20 sec

b. 30 sec

C. 5 sec

d. 10 sec​

Solution:

Let say  Time taken = t secs

Train speed = 15 m/s

Distance covered by train = 15t  m

Man speed = 15 m/s

Distance covered by Man = 10t  m  

Distance to be covered by train = Distance covered by train + length of Train

=> 15t = 10t + 150

=> 5t = 150

=> t = 30

Hence Time taken by train to pa ss the man is 30 secs

correct option is b) 30 secs

Another method:

Effective speed = 15 - 10 = 5 m/s

Distance to be covered = 150m

Time Taken = 150/5 = 30 secs

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