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A squirrel starts climbing up a tree ...

A squirrel starts climbing up a tree at the speed of 6 metres a minute but after every 6 metres it slips down 4 metres in the next minute. It will be able to reach the top 120 metres high in (a) 20 minutes (b) 60 minutes (c) 115 minutes (d) `1 1/2` hours

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