What is the Length of Bridge?

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
vijay Professor Asked on 5th August 2015 in Maths.
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1 Answer(s)

Answer: (1) 3600 m
Explanation:-
The speed of a bike = 54 km/h.
Speed in m/sec = 54 x 5/18
= 3 x 5
= 15 m/sec

The distance covered by the bike in 4 min = the length of the bridge.
1 min = 60 sec
Therefore, 4 min  = 4 x 60 = 240 sec

The distance covered by the bike in 240 sec = 15 x 240
= 3600 m
The length of the bridge is 3600 m.

Hence, the answer is (1) 3600 m.

Anurag Mishra Professor Answered on 6th August 2015.
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