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This Simple Riddle Almost Fooled Einstein

The old car goes a mile up the hill, and then a mile down the hill. It can only go 15 miles an hour up the hill. How fast must the car go down the hill in order to average 30 miles per hour for the entire two-mile trip? Duh, 45 miles per hour. But the explanation in this video went right over my head. Why does it matter how much time the trip takes? Why bring time into it at all? They lost me completely. Can you explain it any simpler than this guy does? -via Digg

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In order to average 30 mph, the complete two mile trip needs to take 4 minutes. However, the first mile took 4 minutes all by itself. Distance divided by speed equals time. 15 mph is .25 miles per minute. 30 mph is .5 miles per minute. 1 divided by .25 is 4. 2 divided by .5 is 4.
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