The average distance between Earth and Mars is about 2.08 108 km.
What are the steps to solve this equation?
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First, realize that the television picture is transmitted by electromagnetic waves which travel at the speed of light.
Then, we know the speed of light is 299,792,458 m/s which is 299,792.458 km/s which is about 3x10^5 km/s
So, we divide 2.08x10^8 km by 3x10^5 km/s to get
693.33 second which equals 11.56 minutes
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