A can finish a work in 7 days. B can finish the same work in 9 days. The number days required to finish the same work by both of them together is

A can finish a work in 7 days. B can finish the same work in 9 days. T

1.	A can finish a work in 7 days. B can finish the same work in 9 days. The number days required to finish the same work by both of them together is
A.	<table><tr><td rowspan="2">1</td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>15</center></td><td rowspan="2"></td></tr><td align="center">16</td></table>
B.	<table><tr><td rowspan="2">2</td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>15</center></td><td rowspan="2"></td></tr><td align="center">16</td></table>
C.
D.	<table><tr><td rowspan="2">3</td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>15</center></td><td rowspan="2"></td></tr><td align="center">16</td></table>
E.	<table><tr><td rowspan="2">4</td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>15</center></td><td rowspan="2"></td></tr><td align="center">16</td></table>
Answer» D. <table><tr><td rowspan="2">3</td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>15</center></td><td rowspan="2"></td></tr><td align="center">16</td></table>

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A can finish a work in 7 days. B can finish the same work in 9 days. The number days required to finish the same work by both of them together is

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