A star is 8.1 x 1013 km away from the earth.Suppose light travels at the speed

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A star is 8.1 x 1013 km away from the earth.Suppose light travels at the speed of 3.0 x 105 km per second. How long will it take light from the star to reach the earth?

Options:

A . 7.5 x 103 hrs

B . 7.5 x 104 hrs

C . 2.7 x 1010 sec

D . 2.7 x 1011 sec

Answer: Option B

(3 x 10⁵)km is covered in 1sec
(8.1 x 10¹³)km covered in
=
=
=(2.7 x 108 x 1/60 x1/60)hrs
=
= (7.5 x 104)hrs

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