Question

Two trains a and b, travelling in opposite directions, cross each other in 6 seconds. The speed of train a is 126 km/h, while that of train b is 90 km/h. If the length of train a is 160 m, what is the length of train b

Answer 1

Answer:

200 m

Explanation:

velocity of train a = 35 m/s

velocity of train b = 15 m/s

As both trains are moving in opposite direction. So the relative velocity of train b with respect to train a = 35 + 15 = 60 m/s

now, let the length of train b = x m

as they cross each other in 6 seconds.

By using the equation

s = v t

160 + x = (60)(6)

therefore x = 200 m