Question

A can complete a task 40% more efficiently in 25 days, whereas B, with a 25% efficiency boost, can finish the same task in 21 days. They collaborated at their original efficiencies for 9 days. Now, how we can determine the time it will take for A to complete the remaining work, reverting to his original efficiency level when working alone.

A 14 days
B 21 days
C 25 days
D 13 days
E none of these
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