OFFICIAL SOLUTION FROM MANHATTAN
Since the insects are crawling along the boundaries of the circles, calculate the circumferences. The circumference of the larger circle is 20pi inches, and that of the smaller circle is 8pi inches.
Next, use the speeds to figure out how long each insect takes to walk around its respective circle exactly once. In each case, RT = D (the circumference).
For the insect on the larger circle, 3piT = 20pi. This insect takes 20 / 3 minutes to crawl around the larger
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Since the insects are crawling along the boundaries of the circles, calculate the circumferences. The circumference of the larger circle is 20pi inches, and that of the smaller circle is 8pi inches.
Next, use the speeds to figure out how long each insect takes to walk around its respective circle exactly once. In each case, RT = D (the circumference).
For the insect on the larger circle, 3piT = 20pi. This insect takes 20 / 3 minutes to crawl around the larger
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