A) \[4:00\text{ }p.m.\]
B) \[5:00\text{ }p.m.\]
C) \[6:00\text{ }p.m.\]
D) \[2:00\text{ }p.m.\]
E) None of these
Correct Answer: C
Solution :
Explanation Option [c] is correct. From the information given in the question it is clear that the monkey climbs 30 feet and slips 20 feet in each hour, thus he actually climbs \[30-20=10\] feet in an hour. Thus, he will climb 90 feet in 9 hours and rest 30 feet in 1 hour, i.e., 9 hours + 1 hour = 10 hours. Beginning time of first ascent = 8:00 a.m. Time at which the monkey will first touch the flag at 120 Feet = 8:00 + 10:00 hours = 18:00 hours or at 6:00 p.m.
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