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      Question

      How many seconds will a train 65 m in length, travelling

      at the rate of 42 km an hour, take to pass another train 80 m long, proceeding in the same direction at the rate of 30 km an hour? TYPE 10
      A 43.5 sec Correct Answer Incorrect Answer
      B 36 sec Correct Answer Incorrect Answer
      C 37.8 sec Correct Answer Incorrect Answer
      D 29 sec Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      Relative speed = 42 – 30 = 12 km/hr Speed (m/sec) = 12 × (5/18) = 10/3 m/sec Time = Total length of both the trains/Relative speed => Time = (80 + 65)/(10/3) = 43.5 sec

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