SOLUTION: A courier who goes at the rate of 7.5 mi./h is followed, after 2.0 h, by another who goes at the rate of 8.5 mi./h. In how many hours will the second overtake the first?
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-> SOLUTION: A courier who goes at the rate of 7.5 mi./h is followed, after 2.0 h, by another who goes at the rate of 8.5 mi./h. In how many hours will the second overtake the first?
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Question 1098064: A courier who goes at the rate of 7.5 mi./h is followed, after 2.0 h, by another who goes at the rate of 8.5 mi./h. In how many hours will the second overtake the first? Answer by ikleyn(52780) (Show Source):
The second courier started when the distance between them was 2*7.5 = 15 miles.
The distance between them decreases at the rate of 1 mile per hour. (8.5-7.5 = 1).
Having this, everybody can conclude that the answer is 15 hours.
