The boards of education of 2 or more school districts may provide jointly for the transportation of pupils to and from any school or schools within or outside the districts.
Whenever in the judgment of the county superintendent of schools transportation of pupils to any qualified school other than a public school could be more economically accomplished by joint transportation with 2 or more school districts, he may order such joint transportation, assign the administration to one board of education and prorate the cost on a per pupil mileage basis to the other boards of education involved.