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Ch.11 Rational ExpressionsAlg 1B Work Word Problems

Ex.1: Amy can paint a loft apartment in 7 hours. Jeremy can paint a loft apartment of the same size in 9 hours. If they work together, how long will it take them to paint a third loft apartment of the same size? (Look at Problem 3 on p694.)

To solve a work problem, find the fraction of the job a person can do in 1 unit of time.

Ex.2: One hose can fill a pool in 12 hours. Another hose can fill the same pool in 8 hours. How long will it take for both hoses to fill the pool together?

Ex.3: Sarah picks a bushel of apples in 45 minutes. Andy picks a bushel of apples in 75 minutes. How long will it take them to pick a bushel together?

Ex.4: David can unload a delivery truck in 20 minutes. Allie can unload the same truck in 35 minutes. If they work together, how long will the unloading take?

HW: Wkst