Vishal Gupta • 7.73K Points
Tutor III Math

Q. A monkey climbs 30 feet at the beginning of each hour and rests for a while when he slips back 20 feet before he again starts climbing in the beginning of the next hour. If he begins his ascent at 8.00 a.m., at what time will he first touch a flag at 120 feet from the ground?

(A) 4 p.m.
(B) 5 p.m.
(C) 6 p.m.
(D) 7 p.m.

Correct Answer - Option(C)
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Clearly, the monkey climbs 10 feet in one hour. So, it will climb upto a height of 90 feet in 9 hours i.e., at 5.00 p.m. It will then ascend a height of 30 feet in the next hour to touch the peak at 6.00 p.m.

Q. A monkey climbs 30 feet at the beginning of each hour and rests for a while when he slips back 20 feet before he again starts climbing in the beginning of the next hour. If he begins his ascent at 8.00 a.m., at what time will he first touch a flag at 120 feet from the ground?

Explanation by: Vishal Gupta

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