Answer:
<em><u>First part: </u></em><em><u>0.35 miles per minute</u></em>
<em><u>Second part: </u></em><em><u>3.5 miles in 10 minutes</u></em>
Step-by-step explanation:
<em>Think about this as a fraction. Fractions can't be added nor subtracted unless they share the same denominator.</em> So for this case, we have to turn hours into minutes. So 21 mph becomes 21 miles per 60 minutes. Then, we divide 60 from each side to find the speed per minute. 21/60 = 0.35, so the answer to the first part is <u>0.35 miles per minute</u>.
<u>Using what we got</u>, we can answer the second part of the distance covered in 10 minutes. So, we just <em><u>multiply</u></em> 0.35 by 10 which is <u>3.5 miles covered in 10 minutes</u>.