The average of their maximum speed was 260 KM per hour if double Malcolm's maximum speed would be 80 KM per hour more than Robbins maximum speed what were Malcolm and Robbie's maximum speed

Malcolm = 200km/h

Robbie = 320km/h

Set Malcolm's speed equal to x. Then Robbies speed would be equal to 2x - 80. By adding these two together and dividing by two, it will equal the average of 260. Solve using cross multiplying.