An insect climbs up 2 cm up a slippery rod in one second and slips donw by 1 cm over the next second. How many seconds wll the insect take to reach the top of the rod 15 cm high?

Time taken by the insect to climb 2cm = 1 second

Time taken by the insect to slip 1cm = 1 second

Hence, it climbs 1cm in 2 seconds

Height of the rod = 15 cm

Therefore, time required = 15 x 2

 = 30 seconds

Hence, the insect needs 30 seconds to climb the rod.

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30 seconds

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