An analytical chemist uses thin-layer chromatography (TLC) to monitor the progress of a synthetic reaction. The resulting chromatogram, alongside a metric scale, is shown below.

Calculate the Rf R_f\,Rf value for substance Q.
Use the equation:
Rf=distance moved by substancedistance moved by solventR_f = \frac{\text{distance moved by substance}}{\text{distance moved by solvent}}Rf=distance moved by solventdistance moved by substance