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    Question

    On Thursday, difference between time taken by the boat

    to cover ‘X’ km upstream and (X+100) km downstream is 20 hours. Had the boat covered same distance upstream as downstream, what would be the difference in time taken then? Study the following table carefully and answer the given questions: Distance Upstream = Distance Downstream Total time taken = Downstream time + Upstream time
    A 45 hours Correct Answer Incorrect Answer
    B 62 hours Correct Answer Incorrect Answer
    C 48 hours Correct Answer Incorrect Answer
    D 56 hours Correct Answer Incorrect Answer
    E 64 hours Correct Answer Incorrect Answer

    Solution

    Downstream speed = 12 + 8 = 20 km/hr Upstream speed = 12 - 8 = 4 km/hr According to question, => X/4 – (X+100)/20 = 20 => 4X = 500 => X = 125 km Downstream distance = 125 + 100 = 225 km Required time = 225/4 – 225/20 = 45 hrs  

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