# Maths

An insect climbs 10m slippery rock in a minute and then slips down 9m in the next minute. How long will it take him to climb a 30m slippery rock?

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1. the bug gains 1m each 2 minutes

after 20*2 minutes it has climbed 20 meters

During the 41st minute it climbs to 30m and is done.

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2. 1hour

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3. 30 minute

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4. Dev kharbanda

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5. 21 minutes

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6. Sorry by mistake,
Answer is 41 minutes not 21 minutes

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