# An insect crawls up 5 cm every second on a 60 cm vertical rod and then falls down 2 cm over the next second . how many secondswill it take to climb the rod ?

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in second it climbs 5cm and falls 2cm so that means in 1 second it climbs 3cm and 60 =3*20 so it will take 20 seconds to climb the rod

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If the insect falls 2 cm every 2nd second, then it climbs 3 cm in two seconds.

60*2/3=120/3=40