[SOLVED] Simple speed of light problem 1. The problem statement, all variables and given/known data How long does it take light to travel trough a 5.23-mm-thick piece of window glass? Trough what thickness of water could light travel in the same amount of time? 2. Relevant equations 3. The attempt at a solution I thought I could just do the speed of light divided by the thickness to get my seconds but thats not right so can someone please help me?