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A monkey clim...

Question

A monkey climbs five metres at the beginning of each minute and then slips back two metres in the next minute before he again starts climbing. If he starts his ascent at 8:00 am, at what time will he first touch a flag 17 metres from the ground?

A

8:10 am

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B

8:06 am

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C

8:09 am

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D

8:12 am

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Solution

The correct option is C 8:09 am
Clearly, the monkey ascends 3 metres in every two minutes and 12 metres in 8 minutes. Now the remaining 5 metres he will ascend in one minute. Thus it takes 9 minutes to touch the flag and so he touches the flag at 8.09 am.

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