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    Question

    A boat sails 150 km in downstream direction in 5 hours.

    If the upstream speed is one-third of its downstream speed, calculate the time it will take to cover 90 km against the current.
    A 12 hrs Correct Answer Incorrect Answer
    B 18 hrs Correct Answer Incorrect Answer
    C 5 hrs Correct Answer Incorrect Answer
    D 9 hrs Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    ATQ,

    Downstream speed of the boat = 150 / 5 = 30 km/h

    Therefore, upstream speed of the boat = 30 / 3 = 10 km/h

    Required time taken = 90 / 10 = 9 hours

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