Ok, I got this scuba diver and he has a tank that is 0.015 meters cubed and filled with compressed air at an absolute pressure of 2.02e7 Pa. Assuming air is consumed at a rate of 0.03 meters cubed per minute and the temperature is constant, how long can this diver stay under water at a depth of 30.0 meters? Assuming the density of the water is 1025 kilograms per meter cubed I found the pressure at 30 ft. below, but I didn't really know what to do with it. Help??