Does anyone know how to do this type of shape/figure

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?

What is a possible solutions of the x> 3?

Write a fraction less than 1, which has a denominator of 6 and is greater than 3/4 plz answer !