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HINT:Lets consider first what the question is asking.
The question is asking for the distance traveled by a knot moving at constant velocity.
HINT:What information does the problem give us?
The problem tells us what the rate of travel is per unit time (velocity) and the length of time for which we want to calculate the distance traveled by the knot.
HINT:What is the relationship between the information given and the
information needed?
The distance traveled by an object at constant speed is equal to
d = v * t
HINT:What information do we need to plug into the relationship?
v = 5000 km/sec
t = 10 years
HINT: Are we going to need to convert the units of any of the information that
we have gathered?
Let's use unit analysis:
d(km) = v(km/s) * t(years)
Since we want our answer in kilometers, we will have to convert years to seconds so that seconds will cancel in our calculation of velocity times time.

Note: we will assume that we are dealing with earth years!
10 (years) * 365.25 (days/year) * 24 (hours/day) * (60 minutes/hour) * (60 seconds/minute) = 3.16 x 108 s
HINT:Plug all of the information in to the final calculation!
d = 5000 km/s * 3.16 x 108 s = 1.58 x 1012 km

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