Who is faster?

Kendra who rides her bike: 0.25 miles per minute

Joey who rides his bike: 20 ft per second

Kendra is going faster. You could convert Kendra's measurement to feet per second by doing to following:

0.25 mi/1 min x 5280 ft/1 mi x 1 min/60 sec

Which equals:

(0.25) (5280) ft/60 sec

Simplify, and Kendra's speed is 22 feet per second.

mi = mile (s)

min = minute (s)

ft = feet

sec = second (s)