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its known that the speed of light is =3 x 108 m/s

and speed=distance/time distance=speed x time

=3 x 108 m/s x 60

=18 x 109 metres

its also known that 1000m=1kilometre

18 x 109 metres=18 x 106 kilometres

hence distance travelled by light in 60 seconds is 18 x 106 kilometres in vaccuum

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