how long would it take two people to wash and wax a car?

Given, Jeff can wash and wax his car in 3 hours, but it takes his dad only 2 hours to wash and wax it. How long would it take the two of them to wash it together?
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1 Answer

In 1 hour Jeff can wash and wax 1/3 of his car, while his dad can wash and wax half of it. Together they can wash and wax 1/3+1/2 of the car=5/6 of the car in an hour. So it will take 6/5hr=1.2hr or 1hr 12min to wash and wax it together.

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