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X can do a work alone in 15 days. Y can ...

X can do a work alone in 15 days. Y can do the same work in 30 days alone. X, Y and Z together can do that work in 9 days. In how many days Z alone can do that work?

A

60

B

90

C

45

D

120

Text Solution

Verified by Experts

The correct Answer is:
B
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