Question

    Boat ‘A’ can cover 150 km in still water in 15

    hours. In still water, if the ratio of the speed of boat ‘A’ to that of ‘B’ is 5:1 and the speed of stream is 3 km/hr then find the time taken by boat ‘B’ to cover the 60 km in downstream.
    A 10 hours Correct Answer Incorrect Answer
    B 11 hours Correct Answer Incorrect Answer
    C 12 hours Correct Answer Incorrect Answer
    D 6 hours Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Speed of boat ‘A’ in still water = 150/15 = 10 km/hr Speed of boat ‘B’ in still water = 10 × (1/5) = 2 km/hr Downstream speed of boat ‘B’ = 2 + 3 = 5 km/hr Time taken by boat ‘B’ to cover 60 km in downstream = 60/5 = 12 hours

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