Respuesta :
It takes 5 minutes per square foot (400/180=5) and so 5 minutes per square for 720 squares: 720x5=3,600. 3,600 minutes is equivalent to 60 hours so it takes him 60 hours.
Answer:
5.25, 5/14, or 21/4 hours
Step-by-step explanation:
400 700
------ = ------
3 x