Into a 100-gal tank initially filled with freshwater flow 3 gal/min of saltwater containing 2 pounds of salt per gallon. The solution kept uniform by stirring, flows out at the same rate. How many...

Into a 100-gal tank initially filled with freshwater flow 3 gal/min of saltwater containing 2 pounds of salt per gallon. The solution kept uniform by stirring, flows out at the same rate. How many pounds of salt will there be in the tank at the end of 1 hour 40 minutes?

o 220 lb
o 240 lb
o None of these
o 190 lb
o 200 lb