A does 20% less work than B. if A can complete a piece of work in $7\frac{1}{2}$ hours, then B can do it in

A does 20% less work than B. if A can complete a piece of work in $7\frac{1}{2}$ hours, then B can do it in
1). $6\frac{1}{2}$ hours
2). 6 hours
3). $5\frac{1}{2}$ hours
4). 5 hours

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