Answer:
Step-by-step explanation:
The reciprocal of a fraction 
is 
Then
The reciprocal of 
is
What are you given that you need to convert to or calculate in km/mn?
He greatest common factor would be 8
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➷ 12 : 40
==> 3 : 10
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The arc length of a subtending arc on a circle has the formula:
s = r<span>θ
where is the arc length
r is the radius
</span><span>θ is the angle subtended
</span>
So,
θ = s/r = 8π / 4.5 = 16<span>π/9
We multiply it with 180/</span><span>π to convert it to degrees.
</span>(16π/90) (180/π) = 320<span>°</span>
