Look at screenshot and please answer

Brook states that the distance on the line is 4 units. caleb states that the whole line does not have a distance because it continues on forever. vivian states that the line is 6 units long. which distance did brook measure? which distance did vivian measure?

I’m stuck on this equation, anyone got the answer?

Awindow washer cleans 42 windows in 2 hours. at this rate, how many windows did he clean in 180 minutes.