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Choose the correct option.
A and B together can complete a work in 12 days. A alone can complete it in 20 days. If B does the work only for half a day daily, then in how many days A and B together will complete the work?
A10 days
B11 days
C15 days
D20 days
Answer: Option (Login/Signup)
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A can do in 20 days so 1 day work = 1/20.
Let B alone can do in x days so 1 day work of B is = 1/x
Acc. to the question= 1/20+1/x= 1/12
We get x= 15 days.
So B alone can do the whole work doing alone in 15 days.
But Acc. to the question he only does half a work daily so he will take 30 days to complete the full work
If B works together with A then
1/30+ 1/20= 1/15 or 15 days will be taken to complete the work.
Let B alone can do in x days so 1 day work of B is = 1/x
Acc. to the question= 1/20+1/x= 1/12
We get x= 15 days.
So B alone can do the whole work doing alone in 15 days.
But Acc. to the question he only does half a work daily so he will take 30 days to complete the full work
If B works together with A then
1/30+ 1/20= 1/15 or 15 days will be taken to complete the work.
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