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Chapter 7: Q.305 (page 719)
Mike, an experienced bricklayer, can build a wall in 3 hours, while his son, who is learning, can do the job in 6 hours. How long does it take for them to build a wall together?
Together it will take them
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Pediatricians prescribe 5 milliliters (ml) of acetaminophen for every 25 pounds of a child鈥檚 weight. How many milliliters of acetaminophen will the doctor prescribe for Emilia, who weighs 60 pounds?
Dennis went cross-country skiing for 6 hours on Saturday. He skied 20 miles uphill and then 20 miles back downhill, returning to his starting point. His uphill speed was 5 mph slower than his downhill speed. What were Dennis鈥� speed going uphill and his speed going downhill?
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?
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?
Curtis was training for a triathlon. He ran kilometers and biked kilometers in a total of hours. His running speed was kilometers per hour less than his biking speed.
What was his running speed?
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