Thank u very much Euindkan..its so simple and i was taking it big and faltered.
@flyrock& Dynamite- Expect these kind of question and these are the question which is going to make u clear the exam and remember they are not looking us as freshers but as future AIRLINE PILOTS(sorry if i am hard & pl come out the freshers shell) and that was a simple q which needs little thinking(Of course i dint do it),still i hunted for the answer and got it...