Monkey Climbing Pole Time
CMAT 2024 · Logical Reasoning · Medium · Speed, Distance and Time
A monkey climbs 20 feet at the beginning of each hour and rests for a while when he slips back 5 feet before he again starts climbing in the beginning of the next hour. If he begins his ascent at 8:00 AM, at what time will he first touch a flag at 110 feet from the ground?
- A.
2:00 PM
- B.
3:00 PM
- C.
4:00 PM
- D.
2:30 PM
B
Explanation
Net climb per hour = feet. In 6 hours (from 8:00 AM to 2:00 PM), net climb = feet. At the start of the 7th hour (2:00 PM), the monkey climbs 20 feet. Height reached = feet. He touches the flag at 110 feet right at the beginning of the 7th hour, which is 3:00 PM (after 7 hours of ascent cycle start).
Hence, Option B is correct.
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