12. A girl leaves her classroom and walk 10 meters North and to a drinking fountain. Then she turns and walk 30 meters South to an art classroom. What is the girl's total displacement from the history classroom to the art classroom?
A. 20 meters North
C. 40 meters North
B. 20 meters South
D. 40 meters South

13. A student walk 1.0 kilometers due East and 1.0 kilometers due South. Then
she runs 2.0 kilometers due West. The magnitude of the student's displacement is close to
A. 3.4 km
C.4.0 km
B. 1.4 km
D. 0

Please help me po, thank you in advance^ω^​