Question 5 * A tank contains 80 lb of salt dissolved in 500 gal of water. The inflow per minute is 20 lb of salt dissolved in 20 gal of water. The outflow is 20 gal/min of the uniform mixture. Inflow 20 ga/min Q = 80 lb %3D Outflow V= 500 gal. 20 gal/min The time when the salt in the tank reaches 300 lb is:

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