Question 691164
You use {{{v=d/t}}} relation twice.

At 45 mph:

{{{45=2/t}}}

{{{t = 2/45}}} hours

At 65 mph:

{{{65 = 2/t}}}

{{{t = 2/65}}} hours

The difference is:

{{{2/45 - 2/65}}} hours

{{{(2*13)/(45*13) - (2*9)/(65*9) = (26-18)/585=8/585 = 0.01367521368}}} hours or approx. 0.82 minutes or approx. 49.23 seconds. VERY SMALL DIFFERENCE. NOT WORTH SPEEDING THROUGH A WORK ZONE.