Question

Interstate 90 is the longest interstate highway in the United States, connecting the cities of Seattle, Washington, and Boston, Massachusetts. The interstate is 4,987,000 meters in length. If 1 mile = 1.609 kilometers, how many miles long is Interstate 90?

Answer 1

Answer:

3099440646.36

Step-by-step explanation:

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Answer 2

Answer:

lets do some dimensional analysis:

$\frac{4,987,000km}{1} =\frac{1 mile}{1.609 km} =\frac{4,987,000 miles}{1.609}$ (km cancel each other out)

so 4,987,000/1.609= 3,099,440.64 miles

Hope this helps!