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    Question

    If the speed of a boat in a still water is 20 km per

    hour and the speed of current is 5 km per hour then the time taken by the boat to travel 100 KM with the current is
    A 3hours Correct Answer Incorrect Answer
    B 4 hours Correct Answer Incorrect Answer
    C 1.5hours Correct Answer Incorrect Answer
    D 2hours Correct Answer Incorrect Answer

    Solution

    . Let the speed of boat in still water =B and speed of stream =S B=20km/h, S= 5km/h Speed of boat in downstream =(B+S) =25km/h Time = Distance /Speed =100/25 =4hours

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