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    Question

    On Friday, if ratio of the speed of boat to the speed of

    stream is 2:1, then what is the difference between the time taken by the boat while going upstream and downstream? Study the following table carefully and answer the given questions: Distance Upstream = Distance Downstream Total time taken = Downstream time + Upstream time
    A 26 hours Correct Answer Incorrect Answer
    B 42 hours Correct Answer Incorrect Answer
    C 30 hours Correct Answer Incorrect Answer
    D 72 hours Correct Answer Incorrect Answer
    E 60 hours Correct Answer Incorrect Answer

    Solution

    Let the speed of the boat and speed of the stream be 2x and x km/hr respectively. According to question, => [360/(2x+x)] + [360/(2x-x)] = 60 => (360/3x) + (360/x) = 60 => x = 8 The speed of stream is 8 km/hr and the speed of boat is 16 km/hr. Required difference = (360/8) - (360/24) = 30 hours

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