Rooney, Hernandez, and Robin race each other in a 100 meters race. All of them run at a constant speed throughout the race.
Rooney beats Hernandez by 20 meters.
Hernandez beats Robin by 20 meters.
How many meters does Rooney beat Robin by ?
100/v1 = 80/v2
100/v2 = 80/v3
20+(20/v2)*v3=20+16 = 36