Between 9 P.M. and 6:20 A.M.​, the water level in a swimming pool decreased by 7/12. Assuming that the water level decreased at a constant​ rate, how much did the water level drop each​ hour?

Answer 1

9pm to 6:20am is 9 1/3 hours

7/12 divided by 28/3 = (7/12)(3/28) = 1/16 per hour

1/16 times 28/3 = 7/12