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The refractive index of water is listed as 1.3, meaning that the speed of light in water is c/1.3 .

Distance = (Speed) x (Time)

Time = (Distance) / (Speed)

Time to cover distance ''D' at speed 'c' = D/c

Time to cover distance 'D' at speed c/1.3 = 1.3D/c

Difference in time = (1.3D/c) - (D/c) = D/c (1.3 - 1) = 0.3D/c

For the sun and earth, D = 93,000,000 miles, c = 186,282 miles per second

0.3 D / c = (0.3 x 93,000,000) / (186,282) = 149.8 seconds = 2-1/2 minutes more

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