(b.) At what rate is the water level rising?

Question

1.      Depth     A swimming pool is 12 meters long, 6 meters wide, 1 meter deep at the shallow end, and 3 meters deep at the deep end (see figure on next page). Water is being pumped into the pool at 1/4 and there is 1 meter of water at  the deep end.

a. What percent of the pool is filled?

b. At what rate is the water level rising?