Respuesta :

Answer: 7 hours

Step-by-step explanation: Divide 420 by 60 or add

60 + 60 = 120(2 hours)

60 + 60 = 120(2 hours)

60 + 60 = 120(2 hours)

60(1 hours)

2 + 2 + 2 + 1 = 7 hours