If the ratio of the lengths of two trains is 2 : 3 and the ratio of the times taken by them to cross each other when travelling in the same direction and when travelling in opposite directions is 4 : 1, the ratio of the speed of the faster train to the speed of the slower train is

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

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