Instructions: Each of the following questions consists of a question followed by three statements I, II and III. You have to study the question and the statements and decide which of the statement (s) is/are necessary to answer the question.
What is the speed of train?
I. The length of train is 240 metre.
II. The train crosses a pole in 24 seconds.
III. The train crosses a platform in 48 seconds.
Length of the train = 240 m
Time taken to cross the pole = 24 seconds
Speed = $$\frac{240}{24}$$ = 10 m/s
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