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    Question

    A boat covers 90 km downstream and 70 km upstream in a

    total time of 10 hours. How much time will it take to travel 126 km downstream and 98 km upstream?
    A 12 hrs Correct Answer Incorrect Answer
    B 15 hrs Correct Answer Incorrect Answer
    C 10 hrs Correct Answer Incorrect Answer
    D 14 hrs Correct Answer Incorrect Answer

    Solution

    Let speed of boat in downstream and upstream be ‘x’ km/h and ‘y’ km/h respectively.

    So, 90/x + 70/y = 10

    And, 126/x + 98/y = 1.40 × (90/x + 70/y) = 1.4 × 10 = 14 hours

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