> Let's assume a cab is driving a customer at a constant speed during one hour. > $30 if they drove below 12mph ($0.50 a minute) Average speed: 30mph => $2.50

> Let's assume a cab is driving a customer at a constant speed during one hour. > $30 if they drove below 12mph ($0.50 a minute) Average speed: 30mph => $2.50 * 30 miles = $75 It is the same, because it was already assumed to be based on exactly one hour.