Subject: mathqa
Question: the distance between two cities a and b is 330 km . a train starts from a at 8 a . m . and travels towards b at 60 km / hr . another train starts from b at 9 a . m . and travels towards a at 75 km / hr . at what time do they meet ?
Option: 
A: 10
B: 12
C: 03
D: 11
Answer: D