light from the sun travels 1.5x10km to reach the earth .how long does it journey take in minutes?

Answer 1

150 million km you mean
which is 1.5 * 10^8 km
which is 1.5 * 10^11 meters

c is about 3 * 10^8 m/s

distance = rate * time

1.5 * 10^11 = 3 * 10^8 t
(1/2) * 10^3 = 7
so t = about 500 seconds
or 8 1/3 minutes