water seeps in at 4 cm/year, is pumped out at 1 m/yr

[kelseykitty]

An uderground water supply has a depth of 200 meters. Water seeps in at the rate of 4 centimeters a year. Water is pumped out at the rate of 1 meter a year. How long will this water supply last? Can anyone help me?

 

[mmm4444bot]

Convert 4 cm to meters.

Subtract it from 1 meter.

The difference is the net depth lost each year.

Divide 200 by this net loss to see how many years the water will last.