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

    Question

    A boat covers a distance of 36 kilometers in still water

    in 24 minutes. If the current's speed is two-fifths of the boat's speed in still water, how long will it take for the boat to travel 243 kilometers against the current?
    A 270 minutes Correct Answer Incorrect Answer
    B 120 minutes Correct Answer Incorrect Answer
    C 210 minutes Correct Answer Incorrect Answer
    D 240 minutes Correct Answer Incorrect Answer
    E 320 minutes Correct Answer Incorrect Answer

    Solution

    Speed of the boat in still water = 36 X (60/24) = 90 km/h Speed of the stream = 90 X (2/5) = 36 km/h Upstream speed of the boat = 90 - 36 = 54 km/h Required time = (243/54) X 60 = 270 minutes

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