Question 965075
We'll use the average speed although as you said the speed wasn't constant.
Convert feet to miles.
{{{128100/5280=24.261}}}{{{mi}}}
So then,
{{{t=24.261/335.92}}}
{{{t=0.07222}}}{{{hr}}}
{{{t=0.07222(3600)}}}
{{{t=260.0}}}{{{s}}}