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3. A frog is at the bottom of a 30 metre deep well. Each hour he manages to climb 3 metres but slips back 2 metres. How many hours does it take him to get out of the well?

4. 28 A frog is at the bottom of a 30 metre deep well. Each hour he manages to climb 3 metres but slips back 2 metres. How many hours does it take him to get out of the well? At the end of the 27 th hour he is 3 metres from the top. During the 28 th hour he climbs the remaining 3 metres and he is out.