(1) Because the distance of 1 cm on the map means that the actual distance is 300 meters, and the distance from the library to the school is 2.5 cm.

The actual distance between the library and the school is: 300×2.5=750 (meters);

So the library is 45 northwest of the school, 750 meters away;

Therefore, the answer is: 45,750 meters west and north.