Andrew M. answered 11/16/17
Tutor
New to Wyzant
Mathematics - Algebra a Specialty / F.I.T. Grad - B.S. w/Honors
20 minutes = 1/3 hours
(1/3)x = 4
x = 12
There are 12 sets of 20 minutes in 4 hours
12(45) = 540 people in 4 hours
people per hour = people/hours
540/4 = 135 people per hour