Mathematics, 14.07.2019 14:00, payshencec21

An empty cylindrical vase with a radius of 8 cm and a height of 9 cm is filled with 6 cm^3 of sand every 15 seconds. at the same time 8cm^3 of sand is taken out of the vase every minute. after how many minutes will the base be half filled with sand?

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An empty cylindrical vase with a radius of 8 cm and a height of 9 cm is filled with 6 cm^3 of sand e...