Answer :
Let's convert the units, to do this we need to cancel the original units to get the units we want; we achieve this the following way:
[tex]2.57\frac{\text{ mi}}{\text{ hr}}\cdot\frac{1609.34\text{ m}}{1\text{ mi}}\cdot\frac{1\text{ hr}}{60\text{ min}}=68.9\frac{\text{ m}}{\text{ min}}[/tex]Therefore 2.57 mi/hr is the same as 68.9 m/min.