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Time & Work
Time, Distance and Speed

A can do a work in 15 days, B can do it in 20 days, and C can do it in 30 days. If they all work together, how long will it take to complete the work?

Answer: B. 5 days
The combined work rate is 1/15 + 1/20 + 1/30 = 1/5. Thus, they will complete the work in 5 days.
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