Pls tell sol for 6,7

Solution,
Q6.
Time take by the light to travel from the sun to the earth, $t=8 min=8\times 60=480s$
Speed of light, $c=3\times {10}^{8}m/s$
Let the distance of the earth from the sun be d.
Then,
$d=ct=3\times {10}^8\frac{m}{s}\times 480s=1440\times {10}^{8}m=1440\times {10}^5 km=1.44\times {10}^8 km$
Q7.
Given,
the distance of a star from the earth is d = 8.33 light minutes.
1 light minute is the distance travelled by light in 1 minute.
Thus,
$$\begin{gathered} 1 light minute = 3\times {10}^8\frac{m}{s}\times 1min= 3\times {10}^8\frac{m}{s}\times 60s=180\times {10}^8 m \\ So, \\ d=8.33 light minutes=8.33\times 180\times {10}^{8}m=1499.4\times {10}^{8}m\approx 1.5\times {10}^{11}m \end{gathered}$$