-5 is the correct answer for this!
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The length of daylight on the moon is about 29.5 days.</span>
From the earliest days, the Moon has been there in the Solar
System and there has never been a period when we couldn't gaze upward in the
night sky and either observe the Moon hanging there, or realize that it would
be back the precise one night from now (i.e. a New Moon).
A day on the Moon keeps going as long as 29.5 Earth days. We
can say that it would take 29.5 days for the Sun to move the distance over the
sky and come back to its unique position once more.
Speed = (distance covered) / (time to cover the distance).
The speed of anything that covers 42 meters in 7 seconds is
(42 meters) / (7.0 seconds)
= (42 / 7.0) (meters/second)
= 6.0 m/s .
