Question

‘X’ and ‘Y’ together can complete a work in 12 days, while ‘Y’ and ‘Z’ together can complete the work in 10 days. If ‘Y’ takes 10 days to complete the work alone then find the time taken by all three together to complete 50% of work.

A 3 days
B 2 days
C 9 days
D 6 days
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