Overview
Murray can hire a dump truck for $40/h (driver included). The truck takes 30 minutes to deliver a load of topsoil and return. It would take 40 hours for one person to load the truck with topsoil. Labourers get $10/h whether they are loading the truck or standing idle while they await its return. How many labourers should be hired to minimize the cost per load? What is the minimum cost?