These students plan to arrive at school for an 8:50 am start. Who will get there in time, and who will be late? Show how much earlier/later they will be than they think. Derek's watch is 15 minutes fast but he thinks that it is 10 minutes fast. Mary's watch is 15 minutes fast but she thinks it is 20 minutes fast. Sara's watch is 15 minutes slow but she thinks it is 10 minutes fast. Tim's watch is 15 minutes slow but he thinks that it is 10 minutes slow. Hettust 1258