# Homework Help: Can you help me ?

1. Jan 13, 2012

### sam_0017

can you help me ??

A 200 liter tank initially contains 100 liters of water with a salt concentration of 0.1 grams per liter.
Water with a salt concentration of 0.5 grams per liter flows into the tank at a rate of 20 liters per
minute. Assume that the fluid is mixed instantaneously and that this well-mixed fluid is pumped out
at a rate of 10 liters per minute. Let c (t) and
v(t), be the concentration of salt and the volume of
water in the tank at time t (in minutes), respectively. Then,
v(t)=10
v(t) c(t) +20c(t)=10

a) Solve these differential equations to find the particular solutions for v(t) and c(t).
b) What is the concentration of salt in the tank when the tank first overflows?

2. Jan 13, 2012

### Ray Vickson

Re: can you help me ??

Go back and read the Forum Rules: you need to present some evidence that you have done your own work, but perhaps have gotten "stuck" and need some hints. What have you done so far?

RGV