How long does it take a message to travel from Earth to a spacecraft on Mars at its closest to Earth (about 56 million {\rm km})? We use radio waves, which travel at the speed of light, to communicate with robotic spacecraft.
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about 3 minutes.
I use miles. I don’t know kilometers, but with miles the equation would be 36,000,000m (36 million miles) divided by 186,000 = 193 seconds.
or around 3.2 minutes.
And, at it’s furthest, about 250,000,000m. it would take around 22 minutes.