Home / Arithmetic Aptitude / Problems on Trains :: Discussion

Discussion :: Problems on Trains

  1. Two trains of equal lengths take 10 seconds and 15 seconds respectively to cross a telegraph post. If the length of each train be 120 metres, in what time (in seconds) will they cross each other travelling in opposite direction?

  2. A.
    10
    B.
    12
    C.
    15
    D.
    20

    View Answer

    Workspace

    Answer : Option B

    Explanation :

    Speed of the first train = 1-sym-oparen-h1 120 1-sym-cparen-h1 m/sec = 12 m/sec.
    10
    Speed of the second train = 1-sym-oparen-h1 120 1-sym-cparen-h1 m/sec = 8 m/sec.
    15

     

    Relative speed = (12 + 8) = 20 m/sec.

    Therefore Required time = 1-sym-obracket-h1 (120 + 120) 1-sym-cbracket-h1 sec = 12 sec.
    20


Be The First To Comment