How long will it take light moving at 300,000 km/s to reach us from the sun?

The average distance from the sun to the Earth

is about 152 million kilometers.

That's (1.52 x 10⁸ km).

Time to cover the distance = (distance) / (speed)

Time = (1.52 x 10⁸ km) / (3 x 10⁵ km/s)

= (506 and 2/3) seconds.

That's 8 minutes 27 seconds.

The popular number is "about 8 minutes".