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    Question

    Speed of current is equal to 25% of speed of boat in

    still water. If the boat takes 5 hours to cover 120 km in still water, then find the time taken by the boat to cover 90 km in upstream.
    A 4 hours Correct Answer Incorrect Answer
    B 6 hours Correct Answer Incorrect Answer
    C 5 hours Correct Answer Incorrect Answer
    D 3 hours Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Speed of the boat in still water = 120 ÷ 5 = 24 km/h Speed of current = 24 × 0.25 = 6 km/h Therefore, upstream speed of the boat = 24 – 6 = 18 km/hr Required time taken = 90 ÷ 18 = 5 hours

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