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    Question

    A person walks at 5 km/h for some time and then

    increases his speed to 8 km/h, covering a total distance of 39 km in 6 hours. For how much time did he walk at the faster speed?
    A 5 hours Correct Answer Incorrect Answer
    B 1 hours Correct Answer Incorrect Answer
    C 3 hours Correct Answer Incorrect Answer
    D 7 hours Correct Answer Incorrect Answer

    Solution

    ATQ, Let time at 5 km/h be t hours Then time at 8 km/h = 6 тИТ t hours Total distance: 5t + 8(6 тИТ t) = 39 5t + 48 тИТ 8t = 39 тИТ3t = тИТ9 тЗТ t = 3 hours So time at 8 km/h = 6 тИТ 3 = 3 hours.

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