How long did he spend at each speed?

Intermediate Algebra
19th Edition
ISBN:9780998625720
Author:Lynn Marecek
Publisher:Lynn Marecek
Chapter7: Rational Expressions And Functions
Section7.5: Solve Applications With Rational Equations
Problem 312E: Ronald can shovel the driveway in 4 hours, but if his brother Donald helps it would take 2 hours....
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A long-distance runner trains for 3 hours. During the first part of the training, he keeps a pace of 7 miles per hour (mph). For the second part, he slows down to 5 mph. At the end of the run, he has traveled a total of 19.5 miles. How long did he spend at each speed?

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