Respuesta :
Each trip is 810 miles, at 7 miles per minute each journey takes 810/7 minutes or 115.71 minutes
8 trips take 115.71 x 8 = 925.68 minutes
925.68/60=15.43 hours
810 divided by 7 = about 115.7 minutes. Round that to 116 minutes. Multiply by 8 to get about 925.6 minutes. Divide by 60 to get about 15 5/12 hours.