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Discussion :: Problems on Trains

  1. A train travelling at a speed of 75 mph enters a tunnel 31/2 miles long. The train is 1/4 mile long. How long does it take for the train to pass through the tunnel from the moment the front enters to the moment the rear emerges?

    2. A.
    2.5 min
    B.
    3 min
    C.
    3.2 min
    D.
    3.5 min

    View Answer

    Workspace

    View Answer

    Answer : Option B

    Explanation :

    Total distance covered
    = 1-sym-oparen-h1 7 + 1 1-sym-cparen-h1 miles
    2 4
     
    = 15 miles.
    4
    Therefore Time taken
    = 1-sym-oparen-h1 15 1-sym-cparen-h1 hrs
    4 x 75
     
    = 1 hrs
    20
     
    = 1-sym-oparen-h1 1 x 60 1-sym-cparen-h1 min.
    20
      = 3 min.

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