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Problem
Brine enters a well-mixed 100-liter tank at 6 L/min with a concentration of 0.5 kg of salt per liter. The mixture drains out at the same 6 L/min. If the tank currently holds 20 kg of salt, calculate
d
y
d
t
\dfrac{dy}{dt}
d
t
d
y
(in kg/min) at that instant.
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