To determine how much the amount of water in the canteen should change every 10 minutes, we can start by calculating the hourly rate:
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The recommended rate is 24 ounces per hour.
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There are 60 minutes in an hour, so we can find the rate per minute by dividing 24 ounces by 60 minutes:
\[ \frac{24 \text{ ounces}}{60 \text{ minutes}} = 0.4 \text{ ounces per minute} \]
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Now, to find the change over a 10-minute period, we multiply the rate per minute by 10:
\[ 0.4 \text{ ounces per minute} \times 10 \text{ minutes} = 4 \text{ ounces} \]
Therefore, the amount of water in the canteen should decrease by 4 ounces every 10 minutes.
The correct response is:
4 ounces