Jake walks a mile to work. If Jake has already walked two-fifths of a mile, how many more feet must he walk to get to work?

1 mile is equal to 5280 feet.

5/5 - 2/5 = 3/5 of a mile left to walk

3/5m * 5280 ft/1m = (3m*5280ft) / (5*1m) = 15840ft/5 = 3158 feet left to walk to get to work.

Or

5280 feet / 5 = 1056 ft * 2 = 2112 ft walked to get to work

5280 - 2112 = 3168 feet left to walk to get to work.