(a) 8927 mi/h
In order to calculate the average speed, we need to convert the time (t=5.0 y) into hours first. In 1 year, we have 365 days, each day consisting of 24 hours, so the time taken is:

The distance covered by the spacecraft is

Therefore, the average speed is just the ratio between the distance covered and the time taken:

(b) 35 minutes (2097 seconds)
The transmitted signals (which is a radio wave, which is an electromagnetic wave) travels back to the Earth at the speed of light:

Since 1 miles = 1609 metres, the distance covered by the signal is

So, the time taken by the signal will be

And since 1 minute = 60 sec, the time taken is

Answer:
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Explanation:
what they said is correct
Answer:
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Explanation:
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10/9
Explanation:
option 2 is the correct answer