You are standing at x=9.0km and your assistant is standing at x=2.0km.?

Lightning bolt 1 strikes at x=0km and lightning bolt 2 strikes at x=13.0km. You see the flash from bolt 2 at t=13μs and the flash from bolt 1 at t=55μs. According to your assistant, were the lightning strikes simultaneous? If not, what was the time difference between the two?
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