Since the bicycle is traveling at 18 miles per hour and each mile is equivalent to 5280 feet, the bicycle covers 18*5280 = 95040 feet per hour.
Each hour is equivalent to 3600 secons. Then, the speed of the bicycle, in ft/s, is given by:
[tex]\frac{95040}{3600}=264\frac{ft}{s}[/tex]Therefore, after 55, the bicycle will cover:
[tex]55\cdot264=1452\text{ ft}[/tex]