July 2022 2 2 Report
Наши дежурные: Лука, Лика и Лиза могут вымыть доску за 2.4 мин. Один Лука смог бы вымыть её за 10.8 мин, а Лика за 7.2 мин. За какое время сможет вымыть доску Лиза?
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