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    Question

    If a boat travels 18 km more in downstream than in

    upstream  in 3 hours and if the speed of the Boat in still water is 20 kmph.  Find the distance travelled by boat in downstream in 4 hours?
    A 92 km Correct Answer Incorrect Answer
    B 117 km Correct Answer Incorrect Answer
    C 88 km Correct Answer Incorrect Answer
    D 148 km Correct Answer Incorrect Answer

    Solution

    Difference in travelling distance in downstream and upstream in 1 hour is 6 km    Let the speed of upstream be x km/hr   Speed of downstream = x + 6 km/hr   speed of the Boat in still water  = 20 km/hr   1/2 x (x + x + 6) = 20   2x + 6 = 40   x = 17 km/hr   Speed of downstream = 17 + 6 = 23 km/hr   Distance travelled in 4 hours = 23 x 4 = 92 km

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