What is the length of a running train?
I. The train crosses a man in 9 seconds.
II.The train crosses a 240 metre long platform in 24 seconds.  Choose the correct choice from the following options:
A) I alone sufficient while II alone not sufficient to answer	B) II alone sufficient while I alone not sufficient to answer	C) Either I or II alone sufficient to answer	D) Both I and II are not sufficient to answer	E) Both I and II are necessary to answer
Explanation:   Time taken by train to cross a man = Length of train / Speed of train =&gt; Speed = L/9 …..(1)   Time taken by train to cross a platform = (Length of train + Length of platform) / speed of train speed = L+240/24 ……(2)   from (1) and (2), we get L/9 = (L+240)/24   Thus, l can be obtained. So both 1 and 2 are necessary to get the answer….   Answer Both I and II are necessary to answer
<result>E</result>
What is the length of a running train?
I. The train crosses a man in 9 seconds.
II.The train crosses a 240 metre long platform in 24 seconds.