Question

‘X’ is 25% more efficient than ‘Y’, and ‘Z’ is 25% less efficient than ‘Y’. Together, they can complete a job in 40 days. If X and Y work together for 30 days, how long will Z take to finish the remaining work?

A 42 days
B 35 days
C 70 days
D 32 days
E None of these
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