SOLUTION: Diego went on a bike ride of 90 miles. He realized that if he had gone 10 mph faster, he would have arrived 12 hours sooner. How fast did he actually ride?

Question 1105455: Diego went on a bike ride of 90 miles. He realized that if he had gone 10 mph faster, he would have arrived 12 hours sooner. How fast did he actually ride?
Answer by josgarithmetic(39630) (Show Source): You can put this solution on YOUR website!

                 SPEED       TIME         DISTANCE
Actual            r          90/r           90
If               r+10        90/(r+10)      90
Difference                    12

Solve this time difference equation:

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