Given below are two quantities named A and B. Based on the given information, you have to determine the relationship between the two quantities. You should use the given data and your knowledge of Mathematics to choose between the possible answers.

Quantity A: A train 100 meters long meets a man going in the opposite direction at 5 km/h and crosses him in 9 seconds. What is the speed of the train?

Quantity B: 35 km/h