Answer
$1.01\times 10^7km $
Work Step by Step
We know that;
$E=mc^2$
We plug in the known values to obtain:
$E=320\times 10^{-6}Kg\times 3\times 10^8\frac{m}{s}=2.88\times 10^{13}J$
As $3.65\times 10^7J=1L$, then
$\implies \frac{2.88\times 10^{13}}{3.65\times 10^7}=789041Liters $
We also know that 1 Liter=12.75km. Therefore;
$\implies 189041\times12.75=1.01\times 10^7Km $
