Answers

2015-10-10T14:25:29+05:30
It will take 20 seconds as

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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2015-10-10T17:15:10+05:30
It is 60 cm tall.
If the insect falls 2 cm every 2nd second, then it climbs 3 cm in two seconds.
60*2/3=120/3=40

Ans=40s 
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