Lance rides his bike downhill at a pace of 60 miles per hour. When Lance is riding uphill, he rides 8 miles per hour slower than on flat roads. If Lance’s downhill speed is 4 times faster than his flat-road speed, how fast does he travel uphill? Let f represent Lance’s pace on flat roads in miles per hour and u represent Lance’s pace uphill in miles per hour.

Use tape diagrams to solve the problem.