A swimming pool is 12 meters long, 6 meters wide

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. Water is being pumped into the pool at ¼ cubic meter per minute, 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?