6х=7у
за час 1/6+1/7=(7+6)/42=13/42
за 3 часа 3/6+3/7=39/42=13/14
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6х=7у
за час 1/6+1/7=(7+6)/42=13/42
за 3 часа 3/6+3/7=39/42=13/14