Blonde joke

There was 3 ladies on an island - 1 blonde, 1 brunette and a red-head. The city where they wanted to be was 20 miles away with sea between the the island and the city. The red-head swam 4 miles and drowned of exhaustion, the brunette sawm 10 miles and drowned of exhaustion, the blonde swam 19 miles, got tired, and swam back!!