Answers: 3
![c = \frac{x}{t} \\where:\\c = velocity or speed light [m/s]\\t = time [s]\\x = distance [m]](/tpl/images/0442/8734/95451.png)
![x =2*\pi *r\\where:\\r = Earth radius [m]\\replacing:\\x = 2*\pi *6400000 = 40212385.97[m]](/tpl/images/0442/8734/d97a6.png)
![t=\frac{40212385.97}{300000000} \\t=0.13[s]](/tpl/images/0442/8734/82dc6.png)
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