To find the rate at which Sam walked, we can use the formula \( r = \frac{d}{t} \), where \( r \) is the rate, \( d \) is the distance, and \( t \) is the time.
In this case:
- \( d = 6 \) kilometers
- \( t = 50 \) minutes
Now, calculate the rate:
\[ r = \frac{6 \text{ kilometers}}{50 \text{ minutes}} = 0.12 \text{ kilometers per minute} \]
Therefore, the rate at which Sam walked is 0.12 kilometers per minute.