How long would it take a radio wave whose frequency is 7.25 x 10^5 Hz to travel from mars to Earth if the distance between the two planets is approximately 8.00 x 10^7 km.
Don't know what to put here.
The Attempt at a Solution
7.25 x 10^5 / 8.00 10^9=9.0625 x 10^-5
Is that they right answer or am i doing this whole thing the wrong way?