Question

it takes 90 mintues to wash 20 vehicles at a car wash. at this rate how many minutes does it take to wash 5 vechicles.

Answer 1

90/20 = 4.5

So, It takes 4.5 minutes to wash 1 car.
4.5* 5 = 22.5
Therefore, it would take 22.5 minutes to wash 5 vehicles.