Convert 2.8 miles per minute to miles per hour. Round to the nearest tenth if necessary. Use $60 \mathrm{~min}=1 \mathrm{hr}$.
Using dimensional analysis, 2.8 miles per minute $=$ $\approx$ miles per hour

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Answer

Final Answer: The speed of 2.8 miles per minute is approximately $\boxed{168.0}$ miles per hour.

Steps

Step 1 ：Given the speed is 2.8 miles per minute.

Step 2 ：We know that there are 60 minutes in an hour.

Step 3 ：To convert miles per minute to miles per hour, we multiply the given speed by the conversion factor, which is 60 minutes per hour.

Step 4 ：So, the speed in miles per hour is $2.8 \times 60 = 168.0$ miles per hour.

Step 5 ：Final Answer: The speed of 2.8 miles per minute is approximately $\boxed{168.0}$ miles per hour.