Subject: mathqa
Question: in traveling from a dormitory to a certain city , a student went 1 / 3 of the way by foot , 1 / 4 of the way by bus , and the remaining 5 kilometers by car . what is the distance , in kilometers , from the dormitory to the city ?
Option: 
A: 15
B: 17
C: 42
D: 12
Answer: D