Time riddle

John has an ancestral wrist-watch bequeathed to him by his grand father. 

Matt has a new watch , a gift from his girl friend. 

John's watch is 10 minutes slow but he thinks it is five minutes fast. Matt's watch is five minutes fast but he thinks it is 10 minutes slow.

One day, they plan to catch a train leaving at 4-o'clock. who would get into the train first??