March 2022 1 11 Report
Бак вместительностью 480 литров был пустой. В него проведены две трубы. Через одну трубу вливается в минуту 120 литров, а через другую выливается 40 литров. За сколько минут наполнится бак, если обе трубы открыть одновременно?
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