Answer:

Explanation:
Speed is given by dividing distance covered by the time taken. In this case, the distance that the turtle covers is equivalent to 1/21 miles and the time taken is 1/2 of an hour hence speed will be given by
![(\frac {1}{21})/(\ frac {1}{2})=\frac {2* 1}{{1* 21}=\frac {2}{21}\ mph]()
Therefore, the rate is equivalent to
