Question

A train 425m long running at a speed of 54km/hr crosses a platform in 50 sec find the length of the platform

Answer 1

Step-by-step explanation:

Step 1. Just change speed from km per hour to meter per second.

So 54 km / hour = 54*1000/(60*60)=54*5/18

=15 meter per second.

Step 2. Check train is passing through post or platform, bridge..

In this case, train is passing through telegraph post. So only train length is considered in passing through a telegraph post as length of telegraph post is negligible.

Step 3. Train length =150 meter

In one second, train cover 15 meter distance.

So in 10 second, it cover 150 meter distance and cross the telegraph post.

Answer 10 second.