November 2021 0 7 Report
1)   Первый насос заполняет цистерну за 6 часов, второй насос затратит на заполнение цистерны 8 часов, а третий насос на эту же работу 12 часов. За сколько часов при совместной работе три насоса заполнят цистерну?  
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