A can do a bit of work in 8 hours while B along can do it in 12 hours. Both A and B cooperating can complete the work in:

 A can do a bit of work in 8 hours while B along can do it in 12 hours. Both A and B cooperating can complete the work in:

A). 10 hours

B). 4 hours

C). 21/4 hours

D). 24/5 hours

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