Problem page a cyclist traveled 20 kilometers per hour faster than an in-line skater. in the time it took the cyclist to travel 80 kilometers, the skater had gone 30 kilometers. find the speed of the skater.

Answer: skater x km/h cyclist 20 faster x + 20 km/h skater 30 km cyclist 80 km skater time = cyclist time t=d/r 30 / x = 80 / (x + 20 cross multiply 30 (x + 20) = 80 x 30 x + 600 = 80 x 30 x - 80 x = - 600 - 50 x = - 600 / - 50 x = 12 km/h 12 km/h skater