The GCF and the LCM with fraction

Alice can run a lap in $\frac{141}{10}$ seconds; Betsy can run a lap in $\frac{235}{14}$ seconds; and Casey can run a lap in $\frac{94}{7}$ seconds. They start running together at the same point $A$ . When Alice , Betsy and Casey meet for the first time at point $A$ , how many laps would Alice have run?

Hint: 1. the GCF is the Greatest Common Factor 2. the LCM is the Lest Common Multiple 3. LCM( $\frac{a}{b}$ , $\frac{c}{d}$ ) = $\frac{ac}{GCF(ad , bc)}$ = $\frac{LCM (ad , bc)}{bd}$