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    Question

    Two trains approach each other at 21 kmph and 24 kmph

    from 2 places 270 km apart. After how many hours they will meet?
    A 5 hours Correct Answer Incorrect Answer
    B 7 hours Correct Answer Incorrect Answer
    C 6 hours Correct Answer Incorrect Answer
    D 4 hours Correct Answer Incorrect Answer

    Solution

    Distance = 270 km Speed of train 1 = 21 km/hr Speed of train 2 = 24 km/hr Relative speed = 21 + 24 = 45 km/hr Therefore, speed = distance/time ⇒ 45 = 270/Time ⇒ Time = 270/45 = 6 hrs

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