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.