- Ernest is driving a diesel express train from Santa Fe for Phoenix which is 520 miles to the East. He leaves at 7:30 am and his average speed is 60 mph. At the same time, 7:30 am in Phoenix a tourism steam train leaves and makes its way towards Santa Fe at 30 mph. At 8:00 am what is the relative velocity of the steam train relative to the Ernest's diesel train? When and where his train meet the other train on the line?