stranded

there was a blonde a red and a brown, they were all stranded on a boat, and there was an island 20 miles away the red head said siince imthe fastest i will go first she swam 10 miles got tired and drown then the brown head said since im the strongest i will go she swam 15 miles and drown then the blond said since im the only one left i will go she swam 19 got tired and swam back to the boat.