Q: If A and B can complete a piece of work in 12 days, B and C can do it in 20 days, and C and A can do it in 15 days, how long would it take A, B, and C to finish it together?

A 4
B 7
C 10
D 15

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Answer: C

Explanation:

The total amount of work that A, B, and C can complete in 1 day is (A+B+C) 1 days work = 1/10.
This means that in 10 days, they will be able to complete 10 * (A+B+C) 1 days work = 10 * (1/10) = 1 unit of work.
Since we know that the task requires 1 unit of work to be completed, this means that A, B, and C will be able to complete the task in 10 days.

Time and Work

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Q: If A and B can complete a piece of work in 12 days, B and C can do it in 20 days, and C and A can do it in 15 days, how long would it take A, B, and C to finish it together?

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