A flat sheet of ice $\backslash (($n$=1\mathrm{.}309)\backslash )$ has a thickness of $1\mathrm{.}6$ cm $.$ It is on top of a flat sheet of crystalline quartz $\backslash (($n$=1\mathrm{.}544)\backslash )$ that has a thickness of $1\mathrm{.}6$ cm $.$ Light strikes the ice perpendicularly and travels through it and then through the quartz. In the time it takes the light to travel through the two sheets, how far $($in cm $)$ would it have traveled in a vacuum?