The Canooing girls of Krokbäcken

Emilia, Louise, Nina and Jennie are living on the other side of lake Rottnen which is about 25km away from the school. They spend lots of money on petrol and by driving the car they polute nature. Now they are planning to canoo over the lake which will take only half the time and no petrol needed ;)
These are the one-man-canoes they plan to use;