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    Question

    A boat travels upstream at a speed of 10 km/h and

    downstream at 15 km/h. If the boat travels 30 km upstream and then returns, how much time does it take for the entire trip?
    A 6 hours Correct Answer Incorrect Answer
    B 5 hours Correct Answer Incorrect Answer
    C 4 hours Correct Answer Incorrect Answer
    D 7 hours Correct Answer Incorrect Answer

    Solution

    Time upstream = Distance / Speed = 30 / 10 = 3 hours. Time downstream = Distance / Speed = 30 / 15 = 2 hours. Total time for the trip = 3 + 2 = 5 hours. Correct answer: B) 5 hours

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