That is, the Science and Technology Museum is 30 southwest of the school, with a distance of 2 cm;

②600÷400= 1.5 (cm)

The library is in the north of the school 15 direction, with a distance of1.5cm;

③ 1200÷400=3 (cm)

The gymnasium is 65 to the northwest of the school, with a distance of 3 cm.

According to the above calculation and description, it is drawn as follows: