Question
At sunrise, an ant began jumping up a 2-metre sand hill. Every minute, it was able to climb up 60 cm, but then slid back 20 cm due to the loose sand. How long did it take the ant to reach the top?
4 m

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At sunrise, an ant began jumping up a 2-metre sand hill. Every minute, it was able to climb up 60 cm, but then slid back 20 cm due to the loose sand. How long did it take the ant to reach the top?