Hi there! The answer is 53 mph.
To find their average speed, we use the following formula.
[tex]v = \frac{s}{t} [/tex]
In this formula:
• v represents velocity
• s represents distance
• t represents time
Filling in this formula gives
[tex]v = \frac{185.5}{3.5} = 53[/tex]
Hence, their average speed must be 53 mph.
