You didn't tell what unit goes with the " 5 x 10² ". That would make this question impossible for somebody who doesn't already know the distance.
If it's 5 x 10² minutes, then the distance is
(3 x 10⁸ m/s) x (5 x 10² minutes) x (60 sec/min) = 9 billion kilometers.
I happen to know that's not right.
Now, let's go back and try 5 x 10² seconds.
Distance = (3 x 10⁸ m/s) x (5 x 10² sec) = 150 million km . . . 93.2 million miles.
Much better !
