A tank initially holds 100 gal of brine solution containing 1 Ib of salt. At t=0 another brine solution containing 1 Ib of salt per gallon is poured into the tank at the rate of 3 gal/min, while a well-stirred mixture leaves the tank at the same rate. Find the time at which the mixture in the tank contains 2 Ib of salt. 0.34 sec 0.203 sec 20.3 sec 30.2 sec none of the choices

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