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I think it must be 300 x 30...
300 million sq feet = 27,870,912 m2
Nothing can travel faster than the speed of light which is 1080 million kms per hour. ( 300 x 106 metres per second)
300 kph = 83.3333333 meters / second ( 83 1/3 )
It seems you are talking about radio waves. The wavelength (40 m) multiplied by the frequency (7 million / second) must equal the speed of light (300 million meters/second). It seems that in this example numbers, either the wavelength or the frequency, or both, are not expressed with a great accuracy. For example, if 40 meters is exact, the frequency would be close to 7.5 MHz.