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    Question

    A person walks at 5 km/h to reach

    the office on time. If the walking speed is increased to 6 km/h, the person will reach 10 minutes earlier. Find the time taken by the person to walk twice the distance at 8 km/h.
    A 2.25 hours Correct Answer Incorrect Answer
    B 7.25 hours Correct Answer Incorrect Answer
    C 8.24 hours Correct Answer Incorrect Answer
    D 1.25 hours Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    ATQ, Let the usual time taken by the person be 'T' hours. Using, distance = speed Ă— time We have, 'D' = 5T ----------- (I) And, 'D' = 6 Ă— {T - (10/60)} -------- (II) From equation (I) and (II), We have, 5T = 6 Ă— {T - (10/60)} Or, 5T = 6T - 6 Ă— (10/60) Or, T = 1 On putting the value of 'T' = 1 in equation (I), We have 'D' = 5 Ă— 1 = 5 km So, the required time = (2 Ă— 5) Ă· 8 = (10/8) = 1.25 hours

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