Subject: mathqa
Question: ann and bob drive separately to a meeting . ann ' s average driving speed is greater than bob ' s avergae driving speed by one - third of bob ' s average driving speed , and ann drives twice as many miles as bob . what is the ratio r of the number of hours ann spends driving to the meeting to the number of hours bob spends driving to the meeting ?
Option: 
A: 2 : 3
B: 8 : 3
C: 3 : 2
D: 3 : 8
Answer: C