A) 15 days
B) 18 days
C) 20 days
D) 60 days
Correct Answer: A
Solution :
If Y does the work in 3 days, X does it in 1 day i.e., the difference is 2 days. But the actual difference is 40 days. If difference is 2 days, X takes 1 day and Y takes 3 days. If difference is 40 days (i.e., 20 times), X takes 20 days and Y takes 60 days. \[\therefore \] Time taken together \[=\frac{20\times 60}{20+60}=15\] days
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