A water tap fills a tub in p hours and a sink at the bottom empties it in q hours. If p < q and both tap and sink are open, the tank is filled in r hours; then

A water tap fills a tub in p hours and a sink at the bottom empties

1.	A water tap fills a tub in p hours and a sink at the bottom empties it in q hours. If p < q and both tap and sink are open, the tank is filled in r hours; then
A.	<table><tr><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>1</center></td><td rowspan="2"> = </td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>1</center></td><td rowspan="2"> + </td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>1</center></td></tr><tr><td style="text-align: center;">r</td><td style="text-align: center;">p</td><td style="text-align: center;">q</td></tr></table>
B.	<table><tr><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>1</center></td><td rowspan="2"> = </td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>1</center></td><td rowspan="2"> - </td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>1</center></td></tr><tr><td style="text-align: center;">r</td><td style="text-align: center;">p</td><td style="text-align: center;">q</td></tr></table>
C.	r = p + q
D.	r = p q
Answer» C. r = p + q

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A water tap fills a tub in p hours and a sink at the bottom empties it in q hours. If p < q and both tap and sink are open, the tank is filled in r hours; then

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