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Discussion :: Time and Work

  1. A train 800 metres long is running at a speed of 78 km/hr. If it crosses a tunnel in 1 minute, then the length of the tunnel (in meters)is

     

  2. A.

    130

    B.

    360

    C.

    500

    D.

    540

    View Answer

    Workspace

    Answer : Option C

    Explanation :

     

    Speed = ( 78 x 5 ( m/sec = ( 65 ( m/sec.
    18 3

    Time = 1 minute = 60 seconds.

    Let the length of the tunnel be x metres.

     

    Then, ( 800 + x ( = 65
    60 3

    " src="/uploads/d_images/m_img_0_1617181673.gif" /> 3(800 + x) = 3900

    " src="/uploads/d_images/m_img_0_1617181673.gif" /> x = 500.


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