Answer
1$\frac{1}{4}$ hour
Work Step by Step
Given, service staff take 7$\frac{1}{2}$ hours to detail 6 cars
We need to find how long it will take to for each car = 7$\frac{1}{2}$ $\div$ 6
= $\frac{15}{2}$ $\div$ 6
= $\frac{15}{2}$ $\times$ $\frac{1}{6}$
=$\frac{15}{12}$
=$\frac{5}{4}$
=1$\frac{1}{4}$ hour
