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    Question

    On Monday, if difference between the time taken by the

    boat to go upstream and the time taken by the boat to go downstream is 15 hours, find the total time taken by the boat to go upstream and downstream. Study the following table carefully and answer the given questions: Distance Upstream = Distance Downstream Total time taken = Downstream time + Upstream time
    A 80 hours Correct Answer Incorrect Answer
    B 65 hours Correct Answer Incorrect Answer
    C 72 hours Correct Answer Incorrect Answer
    D 56 hours Correct Answer Incorrect Answer
    E 40 hours Correct Answer Incorrect Answer

    Solution

    Let the speed of boat be x km/hr. According to question, => [400/(x-3)] - [400/(x+3)] = 15 => x = 13 km/hr Total time taken = (400/10) + (400/16) = 65 hrs

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