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Calculate the distance the spacecraft traveled, with the formula:

distance = speed x time

Then divide that distance by the speed of light, since radio waves travel at the speed of light.

You may have to do some unit conversions for both parts of the calculation.

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10y ago
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Q: How long did it take the radio message sent from Arecibo in 1974 to overtake the pioneer spacecraft traveling at a speed of 10 kilometers per second which had been launched 2 years earlier in 1972?
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