Amixture of two compounds (a and b) was separated by gas chromatography on a non-polar column. the first peak on the chromatogram corresponds to compound a, and that peak was observed at a distance of 5.42 cm from the sample injection point, and it had a height of 3.59 cm and a width at half-height of 1.88 cm. the peak corresponding to b was observed at a distance of 8.99 cm from the injection point, and it had a height of 3.55 cm and a width at half-height of 1.54 cm. the chart paper speed used in the experiment was 100. mm per minute. what was the retention time for compound a (in seconds)?