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    Question

    A boat takes 9 hrs to travel 144 km downstream. The

    speed  of the boat downstream is 2 times the speed of the boat upstream.  What is the speed of the current?
    A 6 km/hr Correct Answer Incorrect Answer
    B 4.5 km/hr Correct Answer Incorrect Answer
    C 7.5 km/hr Correct Answer Incorrect Answer
    D 4 km/hr Correct Answer Incorrect Answer

    Solution

    Speed of boat downstream = 144/9 = 16 km/h Speed of boat upstream = 16/2 = 8  km/h Speed of Current = (Downstream speed – Upstream speed)/2 = (16 - 8)/2 = 4 km/h 

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