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    Question

    A man decided to cover 7.5 km in 72 minutes. He decided

    to cover two thirds of the distance at 5 km/h and the remaining at some different speed. Find the speed after two third distance has been covered.
    A 14.3 km/h Correct Answer Incorrect Answer
    B 15.5 km/h Correct Answer Incorrect Answer
    C 12.5 km/h Correct Answer Incorrect Answer
    D 10 km/h Correct Answer Incorrect Answer

    Solution

    Distance covered at 5 km/h- Distance = 2/3 × 7.5 km = 5 km Time taken for 5 km at 5 km/h- Time 5 km /5 km/h = 1 hour = 60 minutes Remaining distance and time- Remaining distance = 7.5 km -5 km = 2.5 km Remaining time = 72 minutes - 60 minutes = 12 minutes Remaining time in hours = 12 minutes /60 = 0.2 hours Required speed- Speed = 2.5 km /0.2 hours =12.5 km/h

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