"расстояние между Москвой и Казанью 717 км. чему равно расстояние между городами на карте масштабом 1:300000"

I don't have the exact answer to your question about the distance between Moscow and Kazan on a map with a scale of 1:300000. However, you can calculate the distance by multiplying the actual distance of 717 km by the scale factor of 300000.