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Treebeard's Stumper
22 January 1999

Up This Hill and Down

Here's a stumper to ponder as you pedal up the big hill on our annual Dunn Middle School Piece of Cake bike ride this weekend. Betty and Carl start riding at the same time and don't stop. Betty paces herself and does the whole ride at a constant speed. Carl is slow going uphill, so he covers the first half of the distance at a speed 5 miles per hour slower than Betty. He makes up for it coming down, and rides the second half at a speed 5 miles per hour faster than Betty. Who finishes the ride first? Or do they arrive at the same time? It's a piece of cake!

Answer


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Copyright © 1999 by Marc Kummel / mkummel@rain.org