Two trains start simultaneously from two stations A and B, 400 km apart, and run opposite to each other. If they cross each other at a distance 250 km from A, the ratio of the speed of the train at A and that of the train at B is:

Two trains start simultaneously from two stations A and B, 400 km apar

1.	Two trains start simultaneously from two stations A and B, 400 km apart, and run opposite to each other. If they cross each other at a distance 250 km from A, the ratio of the speed of the train at A and that of the train at B is:
A.	3 : 5
B.	3 : 4
C.	5 : 3
D.	4 : 3
Answer» D. 4 : 3