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1. A monkey climbs a 12-meters-high slippery pillar. In his first minute, he climbs 2 meters, and in the next minute, he slips one meter down. In this way, how much time will he take to reach the top of the pillar? What is the correct
- A. 10 minutes
- B. 10 minutes
- C. 10 minutes
- D. 10 minutes
Answer: Option D
Explanation:
Given,
On first minute monkey climb = 2 m
On the second minute it slips = 1 m
Calculation
On first minute monkey climb = 2 m
On the second minute it slips = 1 m
For every two minute,it climbs 1 m
So, average speed = 1 m/2 min
For 10 m, time is taken = 20 min
For the last 2 m jump add 1 min
So time taken = 20 + 1 = 21 min
∴ Monkey takes 21 minutes to reach the top of the pole.
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