Answer:
0.028571428571429 in. each hour
Step-by-step explanation:
Total minutes water level drop:
11 pm - 8:20 am is 9 hrs 20 minutes or 560 minutes.
Drop per minute:
(4/15) ÷ 560 = 0.00047619047619 decrease per minute.
Drop per hour:
60 * 0.00047619047619 = 0.028571428571429 decrease per hour.
If you are allow to round that number:
0.029 = [tex]\frac{29}{1000}[/tex]
