What is the speed of the train?
I.The train crosses a signal pole in 18 seconds.
II.The train crosses a platform of equal length in 36 seconds.
III.Length of the train is 330 metres.	Choose the correct option:  A) I and II only  B) II and III only  C) I and III only  D) III and either I or II only  E) Any two of the three
Explanation:   Let the speed of the train be x metres/sec.   Time taken to cross a signal pole = Length of the train/Speed of the train   Time taken to cross a platform = (Length of the train + Length of the Platform)/Speed of the train   Length of train = 330 m.   I and III gives, 18 =330/x =&gt; x = 330/18 m/sec = 55/3 m/sec.   II and III gives, 36 = 2X330/x = x=660/36 m/sec = 55/3 m/sec.   Answer is (III and either I or II only).
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What is the speed of the train?
I.The train crosses a signal pole in 18 seconds.
II.The train crosses a platform of equal length in 36 seconds.
III.Length of the train is 330 metres.