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:

\(\frac{1}{r} = \frac{1}{p} + \frac{1}{q}\)

\(\frac{1}{r} = \frac{1}{p} - \frac{1}{q}\)

A water tap fills a tub in ‘p’ hours and a sink at the bottom empt

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:
A.	\(\frac{1}{r} = \frac{1}{p} + \frac{1}{q}\)
B.	\(\frac{1}{r} = \frac{1}{p} - \frac{1}{q}\)
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:

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