Question

    Speed of current is equal to 20% of speed of boat in

    still water. If the boat takes 4 hours to cover 120 km in still water, then find the time taken by the boat to cover 96 km in upstream.
    A 5 hours Correct Answer Incorrect Answer
    B 2 hours Correct Answer Incorrect Answer
    C 4 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 ÷ 4 = 30 km/h Speed of current = 30 × 0.20 = 6 km/h Therefore, upstream speed of the boat = 30 – 6 = 24 km/hr Required time taken = 96 ÷ 24 = 4 hours

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