Bob can wash a car in 8 minutes. Joe can wash the same car in 12 minutes. How long will it take to wash the car if Bob and Joe work together?
Answer:
4 minutes 48 seconds .......... In one minute, Bob can wash 1/8 of the car and Joe can wash 1/12 of it. Together, they can wash 5/24 of the car in one minute. This means they can wash the whole car in 24/5 minutes or 4.8 minutes.
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