New Enroll in RBI Grade B New Batch - Starts on May 21

    Question

    Boat ‘A’ can cover 120 km in still water in 12

    hours. In still water, if the ratio of the speed of boat ‘A’ to that of ‘B’ is 5:4 and the speed of stream is 3 km/hr then find the time taken by boat ‘B’ to cover the 264 km in downstream.
    A 20 hours Correct Answer Incorrect Answer
    B 22 hours Correct Answer Incorrect Answer
    C 24 hours Correct Answer Incorrect Answer
    D 21 hours Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Speed of boat ‘A’ in still water = 120/12 = 10 km/hr Speed of boat ‘B’ in still water = 10 × (4/5) = 8 km/hr Downstream speed of boat ‘B’ = 8 + 3 = 11 km/hr Time taken by boat ‘B’ to cover 264 km in downstream = 264/11 = 24 hours

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