A monkey tries to ascend a greased pole 58 metres high. He ascend 12 metres in first minute and slips down 4 metres in the alternate minute. If he continues to ascend in this fashion ,how long does he take to reach the top?
A. 13.30 minutes
B. 12.50 minutes
C. 12.40 minutes
D. 12.5 minutes
Answer: Option B
Solution(By Examveda Team)
Monkey ascends 12 m in 1 minutes and slips 4 m in next minute.It means he ascends
12 - 4 = 8 m in every two minutes.
12-4+12-4+12-4+12-4+12-4+12-4 = 48 m in 12 min
Now next 10 in 60/12 = 10x60/12 = 50 second
12.50 minutes
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