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Tenemos:
ruta total = x
recorre día 1 = x / 4
recorre día 2 = x / 3
recorre día 3 = 35 km
x = x / 4 + x / 3 + 35
x - x / 4 - x / 3 = 35
(4x - x) / 4 - x / 3 = 35
3x / 4 - x / 3 = 35
(3(3x) - 4x) / 12 = 35
(9x - 4x) / 12 = 35
5x / 12 = 35
x = 35(12) / 5
x = 7(12)
x = 84
recorre día 1 = x / 4
recorre día 1 = 84 / 4 = 21
recorre día 2 = x / 3
recorre día 2 = 84 / 3 = 28
ruta total = 84 km
recorre día 1 = 21 km
recorre día 2 = 28 km