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(B) From statement $I$,the length of the train is $240 \ m$,but the time taken is not given.Hence,statement $I$ alone is not sufficient.From statement

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Both $I$ and $II$

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(B) From statement $I$,the length of the train is $240 \ m$,but the time taken is not given.Hence,statement $I$ alone is not sufficient.From statement $II$,the time taken by the train to cross a pole is $24 \ s$,but the length of the train is not given.Hence,statement $II$ alone is not sufficient.From statement $III$,the time taken by the train to cross a platform is $48 \ s$,but the lengths of the train and the platform are not given.Hence,statement $III$ alone is not sufficient.Now,combining statements $I$ and $II$,we have the distance (length of the train) $= 240 \ m$ and the time taken to cross a pole $= 24 \ s$.Speed of the train $= \frac{	ext{Distance}}{	ext{Time}} = \frac{240 \ m}{24 \ s} = 10 \ m/s$.Therefore,both $I$ and $II$ together are sufficient to answer the question.

From the given statements,decide which of the statement$(s)$ is/are necessary to answer the question.
What is the speed of a train?
$I.$ The length of the train is $240 \ m$.
$II.$ The train crosses a pole in $24 \ s$.
$III.$ The train crosses a platform in $48 \ s$.

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From the given statements,decide which of the statement$(s)$ is/are necessary to answer the question.What is the speed of a train?$I.$ The length of the train is $240 \ m$.$II.$ The train crosses a pole in $24 \ s$.$III.$ The train crosses a platform in $48 \ s$.