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An antenna located in a city is a source of radio waves. How much time does it take the wave to reach a town 12,000 km away from the city? 

a. 36 s b. 20 us c. 20 ms d. 40 ms 

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An antenna located in a city is a source of radio waves. How much time does it take the wave to reach a town 12,000 km away from the city? 

a. 36 s b. 20 us c. 20 ms d. 40 ms 

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