A door-door salesperson sells snow shovels and snow blowers, and can drive up to 9500km per week (tough job!). Because snowblowers can be shared among neighbors, the salesperson has to drive an average of 20km to sell a snowblower, but only 5km to sell a snow shovel. The salesperson can work up to 40 hours/week, and it takes an average of 0.05 hours to sell a snowblower (because they practically sell themselves), but 0.12 hours to sell a snow shovel (who wants to shovel?). Each snowblower weighs 25kg while each shovel weighs 2kg, and the salesperson can only carry 6500kg per week on the truck. When sold, a snowblower yields $45 in profit, while a snowshovel only yields $5 in profit.