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Para el más lento: d = 4 m/s t
Para el otro: d = 5 m/s (t - 900 s); igualamos (omito unidades)
5 (t - 900) = 4 t
5 t - 4500 = 4 t; t = 4500 segundos
Luego d = 4 . 4500 = 18000 m = 18 km
Verificamos d = 5 (4500 - 900) = 18000 m
Saludos Herminio