A does 20% less work than B. If A can complete a piece of work in 15/2 h, then B can do it in
A does a work in $$\frac{15}{2}$$ hr., hence in 1 hour work done by A is $$\frac{2}{15}$$
hence work done by B will be  $$\frac{2}{15} \frac{100}{80} $$ = $$ \frac{1}{6} $$ in 1 hour
Hence unit work will be done in 6 hour.
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