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

    Question

    The speed of a boat in still water is 6 km/hr and speed

    of current is 3 km/hr. If time taken to cover a certain distance upstream is 21 hours, then how long will the boat take to cover the same distance downstream?
    A 6 hrs Correct Answer Incorrect Answer
    B 5 hrs Correct Answer Incorrect Answer
    C 7 hrs Correct Answer Incorrect Answer
    D 4 hrs Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Total distance = 21 × (6 – 3) = 63 km Required time = 63/(6 + 3) = 7 hrs

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