Ok simple logic question help?

ok heres the problem... at our school (7th and 8th grade) k.. yea there are 5 7th grade homerooms and 5 8th grade homerooms. nd now our teacher has told the student council had asked us to plan a schedule for a certain date...the event will take place from 12: 30 pm to 3:30 pm...we must have a soccer game, a basketball game and a dodge ball game all at the same time.... we dont need to worry about the place because our school is big and we have the space we just have to plan it.. each homeroom must play all the sports at least once ( basketball, dodge ball and soccer) and each game will take 30 minutes and each home room must play another homeroom from another grade level ( we only have 2 grade levels *7th nd 8th* ) at least once.