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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




answer is 40 seconds.

the insect goes up by 5 cms in one sec.

it comes down by 2 cms in next one sec.

therefore distance travelled in 2 sec =  5-2 = 3cms.

since it travels 3cms in two sec.

therefore to travel 60 cms it will take:

=(60/3)2 sec



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