V = 3*108m/s

T = 8.20 min 

1 min =60s

8.20 min =\(\left(\frac{60s}{1\min}\right)\)=492s 
d=\(\left(3e^8\frac{m}{s}\right)\)\(\)\(\left(492s\right)\)=\(1476e^{11}m\)
\(\frac{1476e^{11}m}{1000}\) = 146  600 000 km

3.-¿Cuántas yardas hay en un kilómetro? 

1 yd = 0.9144m

1 km = 1000m

\(1km=\left(\frac{1000m}{1km}\right)\left(\frac{1m}{0.9144yd}\right)=1093.61yd\)