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Chapter 7: Q. 57 (page 653)
For the following exercises, perform the indicated operations.
The simplified expression is
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Laney wanted to lose some weight so she planned a day of exercising. She spent a total of 2 hours riding her bike and jogging. She biked for 12 miles and jogged for 6 miles. Her rate for jogging was 10 mph less than biking rate. What was her rate when jogging?
Nancy took a 3-hour drive. She went 50 miles before she got caught in a storm. Then she drove 68 miles at 9 mph less than she had driven when the weather was good. What was her speed driving in the storm?
When making the -hour drive home from visiting her parents, Lolo ran into bad weather.
She was able to drive miles while the weather was good, but then driving mph slower, went miles when it turned bad.
How fast did she drive when the weather was bad?
Hudson travels 1080 miles in a jet and then 240 miles by car to get to a business meeting. The jet goes 300 mph faster than the rate of the car, and the car ride takes 1 hour longer than the jet. What is the speed of the car?
Matthew jogged to his friend鈥檚 house 12 miles away and then got a ride back home. It took him 2 hours longer to jog there than ride back. His jogging rate was 25 mph slower than the rate when he was riding. What was his jogging rate?
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