Question

A train goes past you in 10 seconds and goes past a 100 meter long bridge in 30 seconds. What is the length (in meters) and the speed (inm/s) of the train?

Answer 1

Length : 50m

Speed : 5 m / s

Answer 2

Bridge = 300 m

Speed = 10 m/s

Explanation:

If a goes past you in 10 seconds, it means the train has speed of

100 m/ 10 seconds as it is 100 m long

The speed in m/s is:

• 100 m/ 10 s = 10 m/s

Then it take 3 times of 10 seconds to cross the bridge, so

The length of the bridge is:

• 3*100 m= 300 m