Explanation:
65 mi/hr × 1 hr/60 mins × 1 min/60 secs × 1 mi/1609.34m
The units hour, minutes, and miles cancel out. It's easier to notice when writing on paper versus typing.
Now multiple the numerators and divide by the denominators
Numerators: 65 × 1 × 1 × 1 = 65
Denominators: 1 × 60 × 60 × 1609.34 = 5793624
65 m ÷ 5793624 s = 0.0000112192 m/s
Round to appropriate sig figs
0.000011 m/s
This answer sounds wrong, but this is my thinking. Hopefully it helps in some way
