Question

    A boat can travel 32 km downstream in 40 min. The ratio

    of the speed of the boat in still water to the speed of the stream is 5: 3. How much time will the boat take to cover 22 km upstream?
    A 1 hour 12 min Correct Answer Incorrect Answer
    B 1 hour 10 min Correct Answer Incorrect Answer
    C 1 hour 50 min Correct Answer Incorrect Answer
    D 2 hour 30 min Correct Answer Incorrect Answer

    Solution

    Speed of downstream = D/T = 32 × (60/40) = 48 km/hr The ratio of the speed of the boat in still water to the speed of the stream = 5: 3 (5x, 3x) => 8x = 48 => x = 6 Speed of upstream = 5x – 3x = 2x = 12 km/hr Distance = 22 km Time = D/S = 22/12 = 1(5/6) hr = 1 hour 50 min

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