Question

A train passes a standing man in 3 seconds and a platform 105 m long in 8 seconds. Find the length of the train and its speed.​

Answer 1

Answer :-

v = 21 m/s

l = 63 m

Explanation :-

To pass the standing man, train travels the distance equal to its length.

l = v × t

l = 3v

To pass the platform, train travels the distance equal to its length plus platform.

l + 105 = v × t'

l + 105 = 8v

Putting l = 3v,

3v + 105 = 8v

5v = 105

v = 105 / 5

v = 21 m/s

To calculate l,

l = 3v

l = 3 × 21

l = 63 m

Therefore, length of the train is 63 m and velocity is 21 m/s.

Thanks ...

Answer 2

Answer:

21m/s

Explanation:

see 105 m distance train will cover in 5 seconds coz in 3 seconds it will cover the distance of train length ...so 105/5=21m/s