Walter gets up at 6:30 a.m., catches the school bus at 7:30 a.m., has 6 classes that last 50 minutes each, has 30 minutes for lunch, and has 2 hours additional time at school. He takes the bus home and arrives at 4:00 p.m. How many minutes has he spent on the bus?<spanclass=′latex−bold′>(A)</span>30<spanclass=′latex−bold′>(B)</span>60<spanclass=′latex−bold′>(C)</span>75<spanclass=′latex−bold′>(D)</span>90<spanclass=′latex−bold′>(E)</span>120