The snail crawled for a total of 35 cm.
Subtracting the distance it crawled in the morning (15 cm) gives us 35 cm - 15 cm = 20 cm.
Therefore, the snail crawled for 20 cm from the morning until the sun set.
A snail crawled 15 cm in the morning. By the time the sun set, it had crawled 35 cm in total.
How long did the snail crawl for
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