A train 130 m long passes a bridge in 21 seconds moving at a speed of 90 km/hr. Find out the length of the bridge.

Question

How many seconds will a 468 m long train take to cross a man driving his motor bike at a speed of 39 km/hr in a direction of the moving train if the speed of the train is 120 km/hr?

Answer 1

395 meter
.
The train moved 25 meter / sec.
From nose to tail it takes 130 / 25 = 5.2 seconds.
The remaining 21 - 5.2 = 15.8 seconds is the width of the bridge
=> 395 meter