Question 36

A squirrel starts climbing up a tree at the speed of 6 metres per minute but after each 6 metre it slips down 4 metres. It will be able to reach a top of 120 metre high in:

Solution

The aggregate distance covered by squirrel in 1 minute = 6-4 = 2 metres.
So, at the end of 1 minute squirrel will climb 2 metres, at the end of 2 minutes squirrel will climb 4 metres and so on.
At the end of the 57 minute squirrel will have climbed 114 metres.
Now, at the 58th minute it will advance 6 metres more and reach the top.
Therefore, the  correct option is option C.
 


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