3 Girls, each with her father, go for a stroll.they come to a small river. One boat, able to carry 2 persons at a time, is at their disposal. Crossing would be simple,except for the girl`swhim: None is willing to be in the boat, or ashore with 1 or 2 strange fathers , unless her own father is present too. The girl`s of course,can row.How do they all get across.