Question

How do you convert the speed of light m/s to miles per hour

Answer 1

The conversion is \[1 \text{ ms}^{-1} = 2.237\text{ mph} \approx \frac94 \text{ mph}\]

Answer 2

Dimensional analysis
http://www.chem.tamu.edu/class/fyp/mathrev/mr-da.html

Answer 3

1 m = .001 k = 0.00062 mile approx
1 s = (1/3600) hr

1 m / s = 0.00062 mile (3600)/hr = 2.3 mi/hr approx.