Bruce rents a snowmobiles to tourists. He charges $135 for 4 hours and $202.50 for 6 hours. What is the hourly rate Bruce charges to rent a snowmobile.
($202.5-$135) / (6hr-4hr) = $67.5/2hr = drum roll please, $33.75/hour
You could have just said 202.5/6 = 33.75 or 135/4 = 33.75.