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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