an insect crawls up 5cm every second on a 60cm vertical rod and then fell down 2cm over the next second.how many seconds will it take to climb the rod?

refer the similar link:
https://www.meritnation.com/ask-answer/question/reena-climbs-up-6-stairs-every-second-and-climbs-down-3-stai/integers/9379195​

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