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12 February, 14:10

Two people start walking at the same time in the same direction. One person walks at 8 mph and the other person walks at 2 mph. In how many hours will they be 4.5 miles apart?

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  1. 12 February, 14:37
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    Time = distance/speed

    The distance between the walkers increases at the rate of (8 mph) - (2 mph) = 6 mph. That distance will be 4.5 mi after ...

    (4.5 mi) / (6 mi/h) = 4.5/6 h = 3/4 h

    In 3/4 hour they will be 4.5 miles apart.
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