Answer:
0.0625 Inches
Step-by-step explanation:
Divide the decrease in water level by the length of the time interval.
decrease = 7/12 inches ≅ 0.583 inches
Time interval: From 11 pm to 8:20 am you have 9:20 hours = (9 + 20/60) hours ≅ 9.33 hours
So the water drops at a rate of about
0.583/9.33 inches/hour ≅ 0.0625 inches/hour
That means that each hour it drops about 0.0625 inches.
