The North American and European continents are moving apart at a rate of about 3 cm/y. At this rate how long will it take them to drift 400 km farther apart than they are at present?
Added by Gloria C.
Step 1
We need to convert the rate of movement from cm/y to km/y. There are 100,000 cm in 1 km, so we have: $$\frac{3 \text{ cm}}{1 \text{ y}} \times \frac{1 \text{ km}}{100,000 \text{ cm}} = \frac{3}{100,000} \text{ km/y}$$ Show more…
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