А and B can do a piece of work in .
4 day and 6 day respectively then
both will do the work in :
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12/5 days
Step-by-step explanation:
In 4 days a can do x
In 1 day a can do x/4
In 6 days b can do x
In 1 day b can do x/6
both can do x/4 + x/6 = 5/12 in 1 day
Both can do x in 1/5/12= 12/5 day
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