A boy runs at the speed of 54 km/hr. He crosses a bridge in 6 minutes. What is the length (in metres) of the bridge?
Show answer & explanation
Correct answer: B
Explanation
Speed = 54 km/h
In m/s = 54 × 5/18 = 15 m/s
Time = 6 minutes = 360 seconds
Length of the bridge = Speed × Time
= 15 × 360 = 5400 meters