Mathematics, 17.10.2020 18:01, quickestlearner6171

Nicholas's sand castle is 30 cm tall and he is adding sand at a rate of 12 cm per minute. Nina's sand castle is 78 cm tall and she is adding more sand to it at a rate of 6 cm per minute. After how many minutes, x, will Nina and Nicholas's sand castles be the same height?

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Nicholas's sand castle is 30 cm tall and he is adding sand at a rate of 12 cm per minute. Nina's san...