If You Drive at the Posted Speed Limit of 70 $\times$

Multiple Choice

If you drive at the posted speed limit of 70 mph on the interstate,what is the fraction of your speed compared to the speed of light?

A) 6.48 $\times$ 10 ^-8
B) 1.04 $\times$ 10 ^-7
C) 2.33 $\times$ 10 ^-7
D) 3.73 $\times$ 10 ^-7
E) None of these is correct.