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Math Help - Speed-time question..

  1. #1
    Newbie
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    Sep 2008
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    Speed-time question..

    A goods train completely crosses a 120m long bridge with uniform speed v in t seconds. Then it will cross 240m long bridge with uniform speed 2v in. :

    a)t secs
    b)2t secs
    c)less than t secs
    d)more than t secs.
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  2. #2
    Junior Member
    Joined
    Mar 2009
    Posts
    52
    As per the statement
    A goods train completely crosses a 120m long bridge with uniform speed v in t seconds.

    t = 120/v

    Now distance is 240 m and speed = 2v

    Therefore time = 240/2v = 120/v = t secs

    Thanks,
    Ashish
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