Respuesta :
Answer:
60 minutes or 1 hour
Step-by-step explanation:
4, 8, 12, 16, 20, 24, 28, 32, 36, 40, 44, 48, 52, 56, 60
5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60
6, 12, 18, 24, 30, 36, 42, 48, 54, 60
60 minute. All of the trains will arrive every 60 min because it is the LCM