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    Question

    Speed of current is equal to 30% of speed of boat in

    still water. If the boat takes 6 hours to cover 120 km in still water, then find the time taken by the boat to cover 70 km in upstream.
    A 5 hours Correct Answer Incorrect Answer
    B 6 hours Correct Answer Incorrect Answer
    C 4 hours Correct Answer Incorrect Answer
    D 3 hours Correct Answer Incorrect Answer

    Solution

    Speed of the boat in still water = 120 ÷ 6 = 20 km/h Speed of current = 20 × 0.3 = 6 km/h Therefore, upstream speed of the boat = 20 – 6 = 14 km/hr Required time taken = 70 ÷ 14 = 5 hours

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