An insect crawling up a wall crawls 3 c...

An insect crawling up a wall crawls 3 cm upwords in the first minute but then slides 3cm downwards in the next minute. It again crawls up 5 cm upwards in the third mintue but again slides 3cm downwards in the fourth minute. How long will the insect take to reach a carrives in the wall at a height of 25 cm from its starting point ? how does thr position - time graph of the insect look like ?

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