To find the rate at which Sam walked, we can use the formula \( r = \frac{d}{t} \), where:
- \( d \) is the distance (4 kilometers)
- \( t \) is the time (50 minutes)
First, we need to plug in the values into the formula:
\[ r = \frac{4 \text{ kilometers}}{50 \text{ minutes}} = \frac{4}{50} \text{ kilometers per minute} \]
Now, simplifying \( \frac{4}{50} \):
\[ r = \frac{4}{50} = \frac{2}{25} = 0.08 \text{ kilometers per minute} \]
Therefore, the rate at which Sam walked is \( 0.08 \) kilometers per minute.
The correct answer is:
D. 0.08 kilometers per minute
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