You are standing at 90 km lightning bolt 1 at x 0km and, Ask an Expert

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You are standing at = 9.0 km 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 = 3.0km.

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

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