An insect is sitting at the bottom of tree that is 20 meters tall. The insect starts to crawl up the trunk of the tree in a regular spiral. It makes 5 rounds of the tree and reaches the top of the tree at a point directly above the point from which it started. If the speed of the insect is 3 cm/s, what is the time (in seconds) it takes to reach the top of the tree from the moment it starts walking up in a spiral? Assume that the trunk of the tree is a right circular cylinder and it takes the insect 1 minute and 40 seconds to crawl around the base of the truck once.
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