Question
At sunrise, an ant began jumping up a 2-metre sand hill. Every minute, it was able to climb up 50 cm, but then slid back 40 cm due to the loose sand. How long did it take the ant to reach the top?
4 m

Click button first when a symbol is required. X

At sunrise, an ant began jumping up a 2-metre sand hill. Every minute, it was able to climb up 50 cm, but then slid back 40 cm due to the loose sand. How long did it take the ant to reach the top?