Find how many nanoseconds does it take light to travel

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I'm working on this question out of my book and I'm come to a question that I'm very confused on. I'm not really sure where to even start with it. The question is:

Question: How many nanoseconds does it take light to travel a distance of 3.30km in vacuum?

Please explain each step and equations used.

Reference no: EM13700527

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