Andrew M. answered 03/24/17
Tutor
New to Wyzant
Mathematics - Algebra a Specialty / F.I.T. Grad - B.S. w/Honors
Total shift: 8 hrs = 8(60) = 480 minutes
Time not cleaning = 30+30+20 minutes = 80 minutes
Time cleaning: 480-80 = 400 minutes
(400 mins)/(15 rooms) = 26 2/3 minutes per room