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A bicyclist rides his bicycle 21 miles up a hill and then comes back down. His speed coming downhill is 9 miles per hour faster

A bicyclist rides his bicycle 21 miles up a hill and then comes back down. His speed coming downhill is 9 miles per hour faster than going uphill. The round trip takes 3 hours and 30 minutes.

What was the speed of the bicyclist going uphill?

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