Efficiency of X is 20% less than Y to do a certain task. If X alone can complete a piece of work in $$7\cfrac{1}{2}$$ hours, then Y alone cant do it in:

1. $$4\cfrac{1}{2}$$ hours
2. $$5$$ hours
3. $$7\cfrac{1}{2}$$ hours
4. $$6$$ hours

A

1

B

2

C

3

D

4