Subject: mathqa
Question: in 1979 approximately 1 / 3 of the 32.3 million airline passengers traveling to or from the united states used kennedy airport . if the number of such passengers that used miami airport was 1 / 2 the number that used kennedy airport and 4 times the number that used logan airport , approximately how many millions of these passengers used logan airport that year ?
Option: 
A: 1.33
B: 18.6
C: 1.6
D: 9.3
Answer: A