The question given below consists of a statement and /or a question and two statements numbered I and II given below it. You have to decide whether the data provided in the statement(s) is/are sufficient to answer the given question.

What is the speed of the train whose length is 420 metres?

I. The train crosses another train of 600 metres length running in opposite direction in 20 seconds

II. The train travelling crosses another train running in the same direction at the speed of (50/3) m/sec in 60 seconds