Time taken by quasar light to reach Earth = 3 billion years = 3 × 109 years
= 3 × 109 × 365 × 24 × 60 × 60s
Speed of light = 3 × 108 m/s
Distance between the Earth and quasar
= (3 × 108 ) × (3 × 109 × 365 × 24 × 60 × 60)
= 283824 × 1020 m = 2.8 × 1022 km