A ship traveled for 4 hours heading south and for 5 hours headed west. If the total distance traveled was 191 miles, and the ship traveled 4 miles per hour faster heading west, at what speed was the ship traveling west?

The distance: d = v * t

d = v * 4 + 5 * (v + 4)

191 = 4 v + 5 v + 20

9 v = 191 - 20

9 v = 171

v = 171 : 9

v = 19 mph (the speed heading south)

Therefore the speed heading west: v + 4 = 19 + 4 = 23 mph

Answer: The ship was traveling west at 23 miles per hour.