Final answer:
To convert 28 miles per hour to kilometers per minute, multiply by the conversion factors for miles to kilometers and hours to minutes. The answer is approximately 0.75 kilometers per minute.
Step-by-step explanation:
To convert 28 miles per hour to kilometers per minute, we need to convert both the distance and time units. First, we convert miles to kilometers by using the conversion factor 1 mile = 1.60934 kilometers. Multiplying 28 miles by this conversion factor gives us 45.06232 kilometers. Then, we convert hours to minutes by using the conversion factor 1 hour = 60 minutes. Dividing 45.06232 kilometers by 60 minutes gives us approximately 0.75104 kilometers per minute. Since the original value has two significant figures, we need to round our answer to two significant figures. Therefore, the final answer is approximately 0.75 kilometers per minute.