X, Y and Z can do a piece of work in 7 days, 14 days and 28 days respectively. How long will they taken, if all the three work together?

X, Y and Z can do a piece of work in 7 days, 14 days and 28 days respectively. How long will they taken, if all the three work together?

Ques:- X, Y and Z can do a piece of work in 7 days, 14 days and 28 days respectively. How long will they taken, if all the three work together?
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