Subject: mathqa
Question: at 1 : 00 pm , a truck left city p and headed toward city q at a constant speed of 38 km / h . one hour later , a car left city q and headed toward city p along the same road at a constant speed of 42 km / h . if the distance between city p and city q is 378 km , at what time will the truck and the car meet each other ?
Option: 
A: 6 : 15
B: 6 : 30
C: 5 : 45
D: 5 : 30
Answer: A