If A alone can do a work in 12 days and B alone can do it in 8 days, Working together, in how many days will they complete it?

If A alone can do a work in 12 days and B alone can do it in 8 days, W

1.	If A alone can do a work in 12 days and B alone can do it in 8 days, Working together, in how many days will they complete it?
A.	<table><tr><td rowspan="2">4</td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>4</center></td><td rowspan="2">days</td></tr><td align="center">5</td></table>
B.	4 days
C.	<table><tr><td rowspan="2">3</td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>4</center></td><td rowspan="2">days</td></tr><td align="center">5</td></table>
D.	6 days
Answer» B. 4 days

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If A alone can do a work in 12 days and B alone can do it in 8 days, Working together, in how many days will they complete it?

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