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Between 11 P.M. and 8:20 A.M.​, the water level in a swimming pool decreased by 4/15 inches. Assuming that the water level decreased at a constant​ rate, how much did the water level drop each​ hour?

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presdhenry

Answer:

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

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