Answer: The average rate of speed is 3 miles per hour.
Step-by-step explanation: Given that the team tool bella canoed [tex]15\dfrac{3}{4}[/tex] miles in [tex]5\dfrac{1}{4}[/tex] hours. We are given to find the average rate of speed in miles per hour (mph).
We will be using unitary method to solve the given problem.
Now,
[tex]15\dfrac{3}{4}=\dfrac{63}{4},~~~~~5\dfrac{1}{4}=\dfrac{21}{4}.[/tex]
According to the question,
In [tex]\dfrac{21}{4}[/tex] hours, number of miles canoed by the team is
[tex]=\dfrac{63}{4}~\textup{miles}.[/tex]
Therefore, in 1 hour, number of miles canoed by the team is given by
[tex]\dfrac{\frac{63}{4}}{\frac{21}{4}}=\dfrac{63}{4}\times \dfrac{4}{21}=3~\textup{miles}.[/tex]
Thus, the average rate of speed is 3 miles per hour.
