A 500 gal capacity tank initially contains 200 gal of water and 5 lbs of salt per gallon. To reduce the concentration, water at the rate of 3 gal/min enters the tank and the thoroughly mixed solution flows out at the same rate. After 20 min. the process is stopped and brine solution flows into the tank at the same rate of 3 gal/min and at a concentration of 2 Ibs/gal. The mixed solution flows out at the rate of 2 gal/min. Find the amount of salt in the tank 30 min. after resumption of the process.

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
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21.
A 500 gal capacity tank initially contains 200 gal of water and 5 Ibs of
salt per gallon. To reduce the concentration, water at the rate of 3
gal/min enters the tank and the thoroughly mixed solution flows out at
the same rate. After 20 min. the process is stopped and brine solution
flows into the tank at the same rate of 3 gal/min and at a concentration
of 2 lbs/gal. The mixed solution flows out at the rate of 2 gal/min. Find
the amount of salt in the tank 30 min. after resumption of the process.
O 560.17 lb
O 717.71 Ib
O 913.68 lb
O 699.79 lb
Transcribed Image Text:A 500 gal capacity tank initially contains 200 gal of water and 5 Ibs of salt per gallon. To reduce the concentration, water at the rate of 3 gal/min enters the tank and the thoroughly mixed solution flows out at the same rate. After 20 min. the process is stopped and brine solution flows into the tank at the same rate of 3 gal/min and at a concentration of 2 lbs/gal. The mixed solution flows out at the rate of 2 gal/min. Find the amount of salt in the tank 30 min. after resumption of the process. O 560.17 lb O 717.71 Ib O 913.68 lb O 699.79 lb
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