posted by Margaret .
a barrier island is 1 km wide and 10 km long. If erosion by a longshore current causes the island to lose 1.5 m of its with per year, how long will it take for the island to lose one-fourth of its width?
1 km = 1000 m
0.25 * 1000m = 250m = 1/4 of its width
250 / 1.5 = ? years