the index of refraction for acetone is 1.36. what is the speed of light in acetone

acetone n = 1.36 v = c/n v = 3.0 x 10^8 / 1.36 = 2.2 x 10^8 m/s. So light travels 2.2 x 10^8 m/s in acetone. Source: http://hudeckijrsci.weebly.com/uploads/3/7/0/2/3702339/chapter_12_homework_answers.pdf