Question

two trains, each length of 150 metres, are moving in opposite directions with equal speed of 90 km per hour. the time taken by the trains to cross each other will be ​

Answer 1

Answer:12 secs

Explanation:

Answer 2

Answer:

6 sec

Explanation:

Let the time taken by the trains to cross each other is t sec

Given the length of the trains are equal which is 150 m and their speed is 90 km/hr = 25 m/s.

To develop some understanding assume one of the train is at rest. So to cross the other moving train has to travel its length plus the length of the rest train. In this case the moving train has to travel 300 Km to cross the train at rest.

Now  according to question

$150+150-25t=25t$

This gives t=300/50 = 6 sec