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You are standing at x=9.0km. Lightning bolt 1 strikes at x=0km and lightning bolt 2 strikes...

You are standing at x=9.0km. Lightning bolt 1 strikes at x=0km and lightning bolt 2 strikes at x=12.0km. Both flashes reach your eye at the same time. Your assistant is standing at x=4.0km. The assistant does not see the flashes at the same time. What is the time difference between the two?

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