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Answer 1 · 2017-08-04T01:04:20

I got a bit more than #8"min"#

Light in vacuum travels at a speed #c=3xx10^8m/s#.
A beam of light must travel:
#(93xx10^6)/0.62=1.5xx10^8km=1.5xx10^11m#

We can find the time remembering that:

#"speed"="distance"/"time"#

So:
#"time"=(1.5xx10^11)/(3xx10^8)=500s#

corresponding to:

#8"min"# and #20s#

Answer 2 · 2017-08-04T01:05:41

About 8 minute and 20 second.

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