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What is the distance in km of a ...

What is the distance in km of a quasar from which light takes 3.0 billion years to reach us.

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Distance ` = ( 3xx 10 ^( 9) xx 365.25 xx 8.64xx 10 ^4 ) ( 3 xx 10 ^( 5)) km = 2.8 xx 10 ^ (22) km `
where 1 yr = ` 365.25 ` days ` = 365.25 xx 8.64 xx 10 ^ 4 s `
Speed of light =` 3 xx 10 ^( 8) ms ^ ( -1) = 3xx 10 ^(5) kms ^( -1) `
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