SOLUTION: Jill was training for a triathlon, so she planned a day of exercising. She spent a total of 2 hours riding her bike and running. She biked for 12 miles and ran for 6 miles. Her rat

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Question 1162944: Jill was training for a triathlon, so she planned a day of exercising. She spent a total of 2 hours riding her bike and running. She biked for 12 miles and ran for 6 miles. Her rate for running was 10 mph less than her biking rate. What was her rate when running?
Answer by josgarithmetic(39630) About Me  (Show Source):
You can put this solution on YOUR website!
                     SPEED        TIME            DISTANCE
Riding               r+10         12/(r+10)           12
Running               r           12/r                 6
Total                             2

What to do should be clear.