Elisabeth goes for a walk

Elizabeth visits her friend Andrew and then returns home by the same route. She always walks 2km/h when going uphill, 6km/h when going downhill and 3km/h when on level ground. If her total walking time is 6 hours, then what is the total distance she walks in km?

El perro y el conejo (The dog and the rabbit)

Un perro que persigue un conejo avanza 3m con cada zancada. El conejo por su parte avanza con saltos de 2m. ¿En cuántos zancadas alcanzará el perro al conejo si éste tenía una ventaja de 45m?

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A dog chasing a rabbit, which has a start of 45m, jumps 3m every time the rabbit jumps 2m. In how many leaps does the dog overtake the rabbit?