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Time & Work
Time, Distance and Speed

A can do a work in 15 days, B can do it in 10 days, and C can do it in 6 days. How long will it take for all three to complete the work together?

Answer: B. 3 days
A's rate is 1/15, B's is 1/10, and C's is 1/6. Together, they work at a rate of 1/15 + 1/10 + 1/6 = 1/3. Thus, they will complete the work in 3 days.
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