Question

Q.4) A monkey climbs 30 m at the beginning of each hour. It rests for a while and slips 20
m before it again starts climbing in the beginning of the next hour. If it starts climbing at
8 am, at what time will it first touch a flag at a height of 120 m from the ground?​

Answer 1

Answer:

Net ascent of the monkey in 1 hour = (30 - 20) feet = 10 feet.

So, the monkey ascends 90 feet in 9 hours i.e. till 5 p.m.

Clearly, in the next 1 hour i.e. till 6 p.m. the monkey ascends remaining 30 feet to touch the flag.

Answer 2

Answer:

The monkey will touch the flag at the beginning of the 11th hour.

After 10 hours he will be at 100 feet. At the beginning of the 11th hour he will climb to 130 feet before slipping back to 110. The flag is at 120 feet.

Answer: The monkey will touch the flag at the beginning of the 11th hour after start, at 7PM.

Step-by-step explanation:

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