Calculating Light Travel Time Through Different Materials

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[SOLVED] Simple speed of light problem

Homework Statement


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?


Homework Equations





The Attempt at a Solution



I thought I could just do the speed of light divided by the thickness to get my seconds but that's not right so can someone please help me?
 
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