X and Y together can do a piece of work in 18 days. When Y and Z work together they can do the work in 12 days But when X and Z work together, they can do the same piece of work in 24 days.  How many  days will it take to complete the samework if  all of them work together?

A    9

B    6

C    7.5

D    8

Solution

Correct Answer: Option E

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