1 kilometer equal .62 miles.
Knowing the halfway point (which is 5) helps you so you know wither or not the hundred thousands place goes high or stays the same.
So, for this problem 138,202 would round out to 100,000 because the 3 is below 5 so the hundred thousands place stays the same.
We know that we can use trigonometry to solve for x here.
If we use tangent, we can solve for x directly:




So therefore we have solve for x, which is D)
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