Question

A goods train is 800 meters long and it is running at a constant speed of 60 km/per hour. If it takes 120 seconds to pass a bridge, then calculate the length of the bridge?

Options

• 1450

• 1200

• 1600

• 1800

Answer 1

1200
Explanation:
As given in the question,

Speed = 60km/h = `50/3`m/s

Time = 120 s

Let the length of the bridge be 'x' m

Distance = (800 + x)m 

Using the formula,

Speed = Distance/time

`50/3=((800+x))/120`

2000 = 800 + x

Therefore, x = 1200 m

The length of the bridge is 1200 meters.