Answer
$$80\frac{2}{3}ft/s$$
Work Step by Step
1. Convert hours to seconds.
$$\frac{55miles}{1 hour}\times\frac{1 hour}{3600 seconds}=\frac{55 miles}{3600 seconds}$$
2. Convert miles to feet.
$$\frac{55 miles}{3600 seconds}\times\frac{5280 feet}{1 mile}=\frac{290400 feet}{3600 seconds}$$
3. Simplify. $$80\frac{2}{3}ft/s$$
