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    Question

    Train 'A' is 250 meters long and it crosses a pole in

    10 seconds. It also crosses Train 'B' moving in the opposite direction in 10 seconds. If Train 'B' is twice as long as Train 'A', find the distance covered by Train 'B' in 24 minutes.
    A 72 km Correct Answer Incorrect Answer
    B 60 km Correct Answer Incorrect Answer
    C 80 km Correct Answer Incorrect Answer
    D 66 km Correct Answer Incorrect Answer
    E 70 km Correct Answer Incorrect Answer

    Solution

    Speed of Train 'A' = 250 ÷ 10 = 25 m/s Length of Train 'B' = 2 × 250 = 500 meters Combined length of Train 'A' and 'B' = 250 + 500 = 750 meters Relative speed of Train 'B' w.r.t Train 'A' = 750 ÷ 10 = 75 m/s So, speed of Train 'B' = 75 − 25 = 50 m/s = 50 × (18/5) = 180 km/h Distance covered by Train 'B' in 24 minutes = 180 × (24/60) = 72 km

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