To find out how much the amount of water in the canteen should change every 10 minutes, we first need to determine how much water a hiker drinks in that time.
Since hikers are recommended to drink 24 ounces of water per hour, we can break this down:
1 hour = 60 minutes
To find out how much water is consumed per minute: \[ \frac{24 \text{ ounces}}{60 \text{ minutes}} = 0.4 \text{ ounces per minute} \]
Now, for 10 minutes: \[ 0.4 \text{ ounces/minute} \times 10 \text{ minutes} = 4 \text{ ounces} \]
Therefore, the amount of water in the canteen should decrease by 4 ounces every 10 minutes. The correct response is:
4 ounces
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