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    4. Time and distance
    5. A car can finish a certain journey in 10 hours at a speed of 42 kmph. In order to cover the same dis

    Question

    A car can finish a certain journey in 10 hours at a

    speed of 42 kmph. In order to cover the same distance in 7 hours, the speed of the car (km/h) must be increased by
    A 12 Correct Answer Incorrect Answer
    B 15 Correct Answer Incorrect Answer
    C 18 Correct Answer Incorrect Answer
    D 24 Correct Answer Incorrect Answer

    Solution

    speed = (distance/time) distance = speed time = 10 × 42 = 420 km to cover the same distance in 7 hours speed = 420/7 = 60 Km/h increase in speed = 60 -42 =18 km/h

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