KöMaL 2018 K593

A disobedient class were trying to boycott the PE lesson. Therefore, when given the task of throwing a ball along the running track as far as they can, they threw the balls towards the fence instead, in the hope of getting the balls across the fence and halting the lesson while the balls are collected. 1/6 of the students threw 5 balls each, half the class threw 4 balls per student, one student threw 6 balls and all the rest of them threw 2 balls each. They managed to throw 75% of the balls over the fence. Since it took a lot of of time to get all these 66 balls back, the students were punished. They were made to run 3 laps each on the 200-metre running track. How many kilometres did they run altogether?