Christi A large aquarium should contain 10,000 liters of water
when it is filled correctly. It will overflow if it gets up to
12,000 liters. The fish will get sick if it gets down to
4,000 liters. The aquarium has an automatic system to
help keep the correct water level. If the water level is
too low, a faucet fills it. If the water level is too high, a
drain opens.
One day, the system stops working correctly. The drain
opens draining the water at a rate of 20 liters per
minute.