You can paddle your canoe seven miles per hour through any placid lake. The stream flows at three miles per hour. The moment you start to paddle up stream a fisherman drops one of his cork bobbers in the water fourteen miles up stream from you.
How many hours does it take for you and the bobber to meet?
Give up?
Drag your cursor between the asterisks for the answer:
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Two hours
Ignore the speed of the stream, as the bobber will be carried along at three miles per hour (as will you). It takes two hours to travel fourteen miles, at a rate of seven miles per hour.
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