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    Question

    The average speed of a vehicle for a certain number of

    hours is 48 km/hr. If the vehicle travels 120 km in the next hour, the average increases by 2 km/hr. Find the total distance covered before this last hour.
    A 1680 Correct Answer Incorrect Answer
    B 1600 Correct Answer Incorrect Answer
    C 1720 Correct Answer Incorrect Answer
    D 1500 Correct Answer Incorrect Answer

    Solution

    Let the number of hours before the last one be 'P'.
    Distance before = 48P
    (48P + 120) / (P + 1) = 50
    => 48P + 120 = 50P + 50
    => 2P = 70 => P = 35
    Total distance = 48 × 35 = 1680 km

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