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    Question

    A launch covers 225 km in downstream in 5 hours. If the

    upstream speed is one-third of the downstream speed, find the time needed to travel 150 km upstream.
    A 12 hrs Correct Answer Incorrect Answer
    B 18 hrs Correct Answer Incorrect Answer
    C 5 hrs Correct Answer Incorrect Answer
    D 10 hrs Correct Answer Incorrect Answer

    Solution

    ATQ,

    Downstream speed of the launch = 225 / 5 = 45 km/h

    Therefore, upstream speed of the launch = 45 / 3 = 15 km/h

    Required time taken = 150 / 15 = 10 hours

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