Most of these exercises are of an advanced nature. However, any of the exercises from Chapter 8 may be done using odesolve, so look there for more elementary exercises.
Initially, tank A contains 20 gallons of salt solution, while tanks B and C contain 40 and 50 gallons of pure water, respectively. Pure water enters tank A at a rate of 5 gal/min. Salt solution leaves tank A at a rate of 5 gal/min, emptying into tank B at the same rate. In turn, salt solution leaves tank B at 5 gal/min, emptying into tank C at the same rate. Finally, salt solution leaves tank C at 5 gal/min. Because of the constant flow to and from each tank, the volume of solution in each tank remains constant for all time. Tank A initially contains 15 pounds of salt. Use odesolve to estimate the times when the salt content reaches a maximum in tanks B and C.
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