A 100-gal tank is used to hold 5 lb of salt dissolved in 50 gallons of water. A solution of salt per gallon is allowed to flow into the tank at the rate of 2 gallons per minute. uniform by stirring flows out at a rate of 1 gallon per minute. Determine how long amount of salt in the tank to reach 10 lb. a. 18.3 min b. 15.6 min c. 22.8 min d. 17

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