Elizabeth can wash 4 cars in 4 hours. At this rate, how many cars can Elizabeth wash in 8 hours?

Question

 Elizabeth can wash 4 cars in 4 hours. At this rate, how many cars can Elizabeth wash in 8 hours?

Answer 1

4 in 4, 8 in 8

8 cars in 8 hours

assuming she works at the same speed and doesn't slow down or takes any breaks

and not distracted by anything or anyone, and the cars all take an equal amount of time,

at least on average