SOLUTION: If a parade 1 mi long is proceeding at 3 mph, how long will it take a runner jogging at 7 mph to travel from the end of the parade to the start of the parade?

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Question 399274: If a parade 1 mi long is proceeding at 3 mph, how long will it take a runner jogging at 7 mph to travel from the end of the parade to the start of the parade?
Answer by scott8148(6628) About Me  (Show Source):
You can put this solution on YOUR website!
the runner is moving 4 mph (7 mph - 3 mph) relative to the parade

it would take him 15 min (1 mi / 4 mph) to travel the length of the parade