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The frequency does not change the speed the signal travels.

For most math books, the speed of light is indicated as 300,000 km/s (actually 299,792,458 m/s).

So the formula is Time (sec) = Distance (km) / c (300000 km/s).

80,000,000 / 300,000 = 266 2/3 seconds or 4 minutes and 26 2/3 seconds.

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Q: How long would it take a radiowave with a frequency of 725000 hertz to travel from mars to earth if the distance between the planets is 80000000 Kilometers?
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