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    Question

    The speed of the stream is 12

    km/h, and the speed of the boat in still water is 50% greater than the speed of the stream. Calculate the total time required for the boat to cover 18 km upstream and 45 km downstream.
    A 2.5 hrs Correct Answer Incorrect Answer
    B 4.5 hrs Correct Answer Incorrect Answer
    C 3.2 hrs Correct Answer Incorrect Answer
    D 1.8 hrs Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    ATQ,

    Speed of boat in still water = 1.5 × 12 = 18 km/h Upstream speed = 18 – 12 = 6 km/h Downstream speed = 18 + 12 = 30 km/hr Desired time = 18/6 + 45/30 = 3 + 1.5 = 4.5 hours

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