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Tenemos.
Total distancia = x
Recorre a pie = 1/4 de x = 1/4 *x = x/4
Recorre en bicicleta = 1/5 de x = 1/5 * x = x/5
Recorre en tren = 55km
x = x/4 + x/5 + 55 Reduces a común denominador
20x/x = 5x/20 + 4x/5 + 275/5 Simplificas el 5
20x = 5x + 4x + 275
20x = 9x + 275
20x - 9x = 275
11x = 275
x = 275/11
x = 25
Respuesta.
La distancia entre dos ciudades es de 25km