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Time & Work
Time, Distance and Speed

A, B, and C can complete a work in 10, 15, and 30 days respectively. If they work together, how long will it take them to finish the work?

Answer: A. 5 days
The combined work rate is 1/10 + 1/15 + 1/30 = 1/5. Therefore, they will complete the work in 5 days.
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