A frog starts climbing a 30 ft wall. Each hour he climbs 3
ft and slips back 2. How many days does it take him to reach the top and get
out?
Answer: The
answer is not 30 hours. At the end of 27 hours he is 3 ft from the top. And
during the 28th hour he climbs the remaining 3 ft and he is out. So
the answer is 28 hours.
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