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31 March, 17:00

Ling lives 2 miles from school. It took him 15 minutes to bike from school to home. The first half of the distance he biked at a speed of 12 mph. What was his speed for the remaining distance

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  1. 31 March, 17:27
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    As we know that

    time = distance/speed

    The time used for firs half of the trip was

    (1 mi) (12 mi/hour) = 1/12 hours = 5 minutes

    The last half of the trip will took 10 minutes, 1/6 hour.

    Speed = distance / time

    (1 mil) = (1/6h) = 6 mil/h

    so the speed for last half of the trip was = 6mph

    the average speed was

    (2mil) (1/4 hour) = 8 mil/hour

    So the ling's average speed was 8mph.
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