What Is a constant or the product of a constant and one or more variables

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?

You decide instead to take the train there. the train will take 135 minutes. convert this into hours and minutes.

Add the fractions, and simply the result to lowest terms. 2/3 + 2/7= ?