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

    Question

    A boat can cover 145 km in downstream in 5 hours and 144

    km in upstream in 8 hours. Find the speed of boat in still water.
    A 5.9 km/hr Correct Answer Incorrect Answer
    B 7.9 km/hr Correct Answer Incorrect Answer
    C 6.9 km/hr Correct Answer Incorrect Answer
    D 8.9 km/hr Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Downstream speed of the boat = 145/5 = 29 km/hr upstream speed of the boat = 144/8= 18 km/hr Speed of boat in still water = (29 + 18)/2 = 23.5 km/hr

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