SOLUTION: alex and jenny are on a road trip and they are at a rest stop. if jenny leaves first driving at 50mph, and alex leaves 30 minutes later driving at 65 mph, how long will it take for
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Question 1097534: alex and jenny are on a road trip and they are at a rest stop. if jenny leaves first driving at 50mph, and alex leaves 30 minutes later driving at 65 mph, how long will it take for alex to catch up to jenny? Answer by ikleyn(52903) (Show Source):
The solution and the answer = = hours = 1 hour and 40 minutes,
Explanation
0.5 = 0.5 of an hour = 30 minutes given in the condition.
0.5*50 = 25 in the numerator is the distance between Alex and Jenny when Alex started his move.
65-50 = 15 = 15 mph in the denominator is their relative speed = the rate of decreasing the distance between them.
There are other ways to solve this problem, but this one is the shortest.
