Question

Two trains A and B of length 60 m and 40 m running in opposite directions with the same speed and they cross each other in 10 seconds. Then, find the speed of each train.

1. 4 km/h
2. 12 km/h
3. 18 km/h
4. 5 km/h

Answer 1

Correct Answer - Option 3 : 18 km/h

Given:

Length of train A = 60 m

Length of train B = 40 m

Time taken to cross each other = 10 seconds

Formula used:

Speed = Distance/Time

Calculation:

Let the speed of both trains be x m/s

Relative speed = (x + x)km/h = 2x m/s

Now,

Time = (60 + 40)/(2x)

⇒ 10 = 100/2x

⇒ 2x = 10

⇒ x = 5 m/s

⇒ x = 18 km/h      [1 m/s = 18/5 km/h]