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Timework11

0. A train traveling at 42 km/hr. passes a cyclist going in the same direction in 9 secs.; if cyclist had been going in the opposite direction, the train would have passed him in 5 secs. Length of the train is

  • Option : A
  • Explanation :
    Let L is length of train in km and x is speed of the cyclist, Then
    (i) 400L = 42 - x
    (ii) 720 L = 12 + x
    On adding, we get
    1120 L = 84
    ⇒ L = (84 x 1000)/1120 = 75m
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