To find out how many miles the car travels in one minute, we first calculate its speed in miles per minute:

1. Calculate the speed:
   The car travels 20 miles in 30 minutes, so the speed is: $\text{Speed} = \frac{20 \text{ miles}}{30 \text{ minutes}} = \frac{2}{3} \text{ miles per minute}$

Therefore, the car travels $\frac{2}{3}$ miles in one minute.

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Related Questions:

1. How many miles would the car travel in 45 minutes at the same speed?
2. If the car continued at this speed, how long would it take to travel 50 miles?
3. What is the car's speed in miles per hour?
4. If another car takes 25 minutes to travel the same distance, what is its speed in miles per minute?
5. How much time would the car save if it increased its speed to 1 mile per minute?

Tip:

When converting units (e.g., minutes to hours), remember to keep consistent units throughout the calculations.