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    Question

    A man goes downstream with a boat to some destination

    and returns upstream to his original place in 5 hours. If the speed of the boat in still water and the stream is 10km/h and 4km/h respectively, the distance of the destination from the starting place is
    A 21km Correct Answer Incorrect Answer
    B 18km Correct Answer Incorrect Answer
    C 22km Correct Answer Incorrect Answer
    D 24km Correct Answer Incorrect Answer

    Solution

    Let the speed of boat in still water =B and speed of stream =S B=10km/h, S=4km/h B+S=14km/h B-S=6km/h Let Distance =D km D/14+D/6=5 10D=210 D=21km

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