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

    Question

    A boat can cover 188 km in downstream in 4 hours and 140

    km in upstream in 7 hours. Find the speed of boat in still water.
    A 32.5 km/hr Correct Answer Incorrect Answer
    B 31.5 km/hr Correct Answer Incorrect Answer
    C 33.5 km/hr Correct Answer Incorrect Answer
    D 30.5 km/hr Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Downstream speed of the boat = 188/4 = 47 km/hr Upstream speed of the boat = 140/7 = 20 km/hr Speed of boat in still water = (47 + 20)/2 = 33.5 km/hr

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