Can fractions be relatively prime? Two numbers are relatively prime if they do not share any factors, other than 1. Is it possible for fractions to be relatively prime? To reword this, do fractions even have factors?

Relatively prime applies usually to integers, but like Bill Dubuque's link says you can extend the idea of factors to fractions by having a common base.
$\frac{1}{3}, \frac{2}{5}$ become $\frac{5}{15}, \frac{6}{15}$ which have relatively prime numerators. In this sense fractions are just integers split up into a common number of parts.
