Correct option is A
Given:
Worker X does half as much work as Y in
61 of the time.
Together, X and Y can complete the job in 10 days.
Formula Used:
Total Work=Efficiency×Times Solution:
X does half as much work as Y in
61 of the time.
If Y's efficiency is 1 unit , then,
X"s efficiency is 3.
Now, Time taken together X + Y = 10 days
Total work =
(1+3)×10=40unit Time taken by Y to work alone,
Time =
140=40days