Originally Posted by

**mpweber** I have had this problem for a week now. I do not even know where to begin.

You have 26 tanks of water.

1 giant tank that holds a maximum of 27million L

25 smaller tanks that hold a maximum of 130k L each

You have 5 pumps that are filling the 25 smaller tanks with 10k L per second divided evenly among all the smaller tanks (each pump does 10k L/s)(this water comes from nowhere, infinite amount)

You have 17 pumps that are pumping water out of the large tank at a rate of 10k L per second (this water goes nowhere)

The giant tank is also pumping 30% of the current amount of water from each of the smaller tanks to itself every 1 second.

The giant tank starts at 14mil L

The Smaller tanks start at 130k L each

At what rate would the Giant tank become empty?

I know that the large tank is draining at a rate of 170,000 liters per second

I know that the smaller tanks are filling at a rate of 2,000 liters per second each

What I cant figure out is the rate at which the Large tank is filling, or the rate at which the smaller tanks are draining.