The first thing to do is calculate the times it takes with the velocity of 120 and the space traveled (3 cm)
[tex]\begin{gathered} v=\frac{d}{t} \\ t=\frac{d}{v} \\ t=\frac{3}{120}=0.025 \end{gathered}[/tex]Now, we make the following proportion:
[tex]\begin{gathered} \frac{0.025}{3}=\frac{1.5}{x} \\ x=\frac{1.5\cdot3}{0.025} \\ x=180 \end{gathered}[/tex]therefore, the distance is 180 cm
