X - всего км
1/4х + 5/12 * 3/4х + 35 = х
1/4х + 15/48х + 35 = х
27/48х + 35 = х
21/48х = 35
х = 80
Ответ: 80 км
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X - всего км
1/4х + 5/12 * 3/4х + 35 = х
1/4х + 15/48х + 35 = х
27/48х + 35 = х
21/48х = 35
х = 80
Ответ: 80 км