You are standing at x90km lightning bolt 1 at x0km and, Ask an Expert

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You are standing at x=9.0km Lightning bolt 1 at x=0km and lightning bolt 2 at x=12.0km Both flashes reach your eye at the same time. Your assistant is standing at x=2.0km

If your assistant didn't see the flashes at the same time, what is the time difference between the two flashes?

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