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    Question

    Speed of current is equal to 15% of speed of boat in

    still water. If the boat takes 3 hours to cover 120 km in still water, then find the time taken by the boat to cover 68 km in upstream.
    A 5 hours Correct Answer Incorrect Answer
    B 6 hours Correct Answer Incorrect Answer
    C 2 hours Correct Answer Incorrect Answer
    D 7 hours Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Speed of the boat in still water = 120 ÷ 3 = 40 km/h Speed of current = 40 × 0.15 = 6 km/h Therefore, upstream speed of the boat = 40 – 6 = 34 km/hr Required time taken = 68 ÷ 34 = 2 hours

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