In a gas chromatography experiment, a mixture of two compounds (A and B) was separated for analysis. A chart recorder that fed paper at a constant rate of 100 mm. per minute was used to record the chromatogram, and a mark was made on the chart at the time the sample was injected. The first peak on the chromatogram corresponds to compound A, and that peak was observed at a distance of 5.73 cm from the sample injection point, and it had a height of 3.1 cm and a width at half-height of 1.53 cm. The peak corresponding to B was observed at a distance of 8.02 cm from the injection point, and it had a height of 3.6 cm and a width at half-height of 1.25 cm. What was the retention time for compound B (in seconds)