Question

Person 'X' can complete a task in 30 days when working at full efficiency, while person 'Y' can finish the same task in 50 days at full efficiency. If 'Y' works at only 62.5% efficiency and 'X' works at only 75% efficiency, how many days will it take for both 'X' and 'Y' to complete the task together?

A 80/3 days
B 77/3 days
C 67/9 days
D 55/2 days
E None of these
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