Question

Between 9pm and 6:54 A.M., the water level in the swimming pool decreased by 9/20 in. Assuming that the water level decreased at a constant rate, how much did the water level drop each hour?

Answer 1

0.0456 inches each hour

Explanation:

The time difference between 9pm and 6:54 AM is 9 hours and 54 minutes. Converting to minutes, the time difference is 9*60 + 54 = 594 minutes.

The water level decreased by 9/20 inches, which is equal to 0.45 inches.

The rate of water level drop per hour is 0.45 inches / 594 minutes = 0.00076 inches/minute.

In decimal form, the rate of water level drop per hour is 0.00076 * 60 minutes/hour = 0.0456 inches/hour.

Therefore, the water level dropped by 0.0456 inches each hour.