A person riding a bike crosses a bridge with a speed of

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A person riding a bike crosses a bridge with a speed of 54 km/h. What is the length of the bridge, if he takes 4 min to cross the bridge?

1. 3600 m
2. 2800 m
3. 3500 m
4. 4500 m

Correct Option: A

Length of the bridge = Distance travelled by the person in 4 min = Speed x Time
Speed = 54 km/h = 54 x (5/18) = 3 x 5 = 15 m/s
Time = 4 min = 4 x 60 = 240 s
∴ Required length = 15 x 240 = 3600 m