A can do a piece of work in 30 days while B can do it in 40 days. In how many days can A and B working together do it ?

A can do a piece of work in 30 days while B can do it in 40 days. In h

1.	A can do a piece of work in 30 days while B can do it in 40 days. In how many days can A and B working together do it ?
A.
B.	<table><tr><td rowspan="2">42</td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>3</center></td><td rowspan="2">days</td></tr><td align="center">4</td></table>
C.	<table><tr><td rowspan="2">27</td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>1</center></td><td rowspan="2">days</td></tr><td align="center">7</td></table>
D.	<table><tr><td rowspan="2">17</td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>1</center></td><td rowspan="2">days</td></tr><td align="center">7</td></table>
E.	70 days
Answer» D. <table><tr><td rowspan="2">17</td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>1</center></td><td rowspan="2">days</td></tr><td align="center">7</td></table>

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A can do a piece of work in 30 days while B can do it in 40 days. In how many days can A and B working together do it ?

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