A drug is carried into an organ of volume 
cm3 by a liquid that enters the organ at the rate of p cm3/sec and leaves it at the rate of q cm3/sec. The concentration of the drug in the liquid entering the organ is r g/cm3. If the concentration of the drug in the organ at time 
is increasing at the rate of
?
?g/cm3/sec, and the concentration of the drug in the organ initially is 
g/cm3, find the concentration of the drug in the organ at time 
.
?
A. 
B. 
C. 
D. 
Answer: C
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?
?
A. 
B. 
C. 
D. 
E. 