December 2021 1 21 Report
Игорь и Паша кра­сят забор за 35 часов. Паша и Во­ло­дя кра­сят этот же забор за 40 часов, а Во­ло­дя и Игорь — за 56 часов. За сколь­ко часов маль­чи­ки по­кра­сят забор, ра­бо­тая втро­ем?
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