A does 20% less work than B. If A can complete a piece of

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A does 20% less work than B. If A can complete a piece of work in
7 1 hours, then B can do it in
2

A does 20% less work than B.
∴ Ratio of time taken = 5 : 4

A completes a work in	15	hours
	2

∴ Time taken by B to do the same work

	15	×	4	= 6 hours.
	2		5

7	1	hours, then B can do it in
	2