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Time & Work
Time, Distance and Speed

If A can do a piece of work in 12 days and B can do it in 15 days, how long will it take for both A and B to complete the work together?

Answer: A. 7.2 days
The combined work rate is 1/12 + 1/15 = 1/7.2, so they will complete the work in 7.2 days.
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