The separation of two coloured substances was done by paper chromatography. The distance travelled by solvent front, substance A and substance B from the base line are 3.25cm, 2.08cmand 1.05cm, respectively. The ratio of Rf values of A to B is ________.
<p><math><msubsup><mrow><mi>R</mi></mrow><mrow><mi>f</mi></mrow><mrow><mn>0</mn></mrow></msubsup><mo>=</mo><mrow><mtext> </mtext><mtext> distance travelled by the solute</mtext><mtext> </mtext></mrow><mtext> </mtext></math><math> / </math><math><mtext>/ distance travelled by the solvent</mtext></math></p><p><math><mrow><msub><mrow><mrow><mo> (</mo><mrow><msub><mrow><mi>R</mi></mrow><mrow><mi>f</mi></mrow></msub></mrow><mo>)</mo></mrow></mrow><mrow><mi>A</mi></mrow></msub><mo>=</mo><mfrac><mrow><mn>2</mn><mo>.</mo><mn>0</mn><mn>8</mn></mrow><mrow><mn>3</mn><mo>.</mo><mn>2</mn><mn>5</mn></mrow></mfrac><mtext></mtext><mtext></mtext><msub><mrow><mrow><mo> (</mo><mrow><msub><mrow><mi>R</mi></mrow><mrow><mi>f</mi></mrow></msub></mrow><mo>)</mo></mrow></mrow><mrow><mi>B</mi></mrow></msub><mo>=</mo><mfrac><mrow><mn>1</mn><mo>.</mo><mn>0</mn><mn>5</mn></mrow><mrow><mn>3</mn><mo>.</mo><mn>2</mn><mn>5</mn></mrow></mfrac></mrow></math></p><p><math><mrow><mfrac><mrow><msub><mrow><mrow><mo> (</mo><mrow><msub><mrow><mi>R</mi></mrow><mrow><mi>f</mi></mrow></msub></mrow><mo>)</mo></mrow></mrow><mrow><mi>A</mi></mrow></msub></mrow><mrow><msub><mrow><mrow><mo> (</mo><mrow><msub><mrow><mi>R</mi></mrow><mrow><mi>f</mi></mrow></msub></mrow><mo>)</mo></mrow></mrow><mrow><mi>B</mi></mrow></msub></mrow></mfrac><mo>=</mo><mfrac><mrow><mn>2</mn></mrow><mrow><mn>1</mn></mrow></mfrac></mrow></math></p>
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