A swimming pool is 40 ft long, 20 ft wide, 8 ft deep at the deepest end and 3 ft deep at the shallow end, the bottom being rectangular. If the pool is filled by pumping water into it at the rate of 100 ft3/min. How fasr is the water level rising when it is 3 ft deep at the deepest end. Pls solve using derivatives relative rates. Correct answer is 5/24