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    Question

    A boat can cover 220 km in downstream in 10 hours and

    170 km in upstream in 17 hours. Find the distance travelled by the boat in still water in 5 hours.
    A 82 km Correct Answer Incorrect Answer
    B 70 km Correct Answer Incorrect Answer
    C 80 km Correct Answer Incorrect Answer
    D 75 km Correct Answer Incorrect Answer

    Solution

    Downstream speed of the boat = 220/10 = 22 km/hr Upstream speed of the boat = 170/17 = 10 km/hr Speed of boat in still water = (22 + 10)/2 = 16 km/hr Distance travelled by the boat in still water in 5 hours = 16 × 5 = 80 km

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