Two trains started at the same time, one from A to B and the other from B to A .

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Two trains started at the same time, one from A to B and the other from B to A . If they arrived at B and A respectively 4 hours and 9 hours after they passed each other the ratio of the speeds of the two trains was 

A. 2:1
B. 3:2
C. 4:3
D. 5:4

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