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    Question

    Train ‘M’ is travelling with a speed of 72 km/hr

    and crosses a vertical pole in 5 seconds. Train ‘N’ is 25 metres longer than ‘M’ and travelling with a speed 1/4th less than that of train 'M'. In how much time train N can cross a 175 metres long platform?
    A 21 sec Correct Answer Incorrect Answer
    B 22 sec Correct Answer Incorrect Answer
    C 19 sec Correct Answer Incorrect Answer
    D 20 sec Correct Answer Incorrect Answer

    Solution

    Speed of train ‘M’ = 72 × (5/18) = 20 m/sec Length of train ‘M’ = 20 × 5 = 100 metres Therefore, speed of train ‘N’ = (3/4) × 20 = 15 m/sec Length of train ‘N’ = 100 + 25 = 125 metres Required time taken = (125 + 175)/15 = 20 seconds 

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