Discussion :: Time and Distance

wo towns are connected by railway. Can you find the distance between them?
I.
The speed of the mail train is 12 km/hr more than that of an express train.
II.
A mail train takes 40 minutes less than an express train to cover the distance.
A.
I alone sufficient while II alone not sufficient to answer 

B.
II alone sufficient while I alone not sufficient to answer 

C.


D.
Both I and II are not sufficient to answer 

E.
Both I and II are necessary to answer 
Answer : Option D
Explanation :
Let the distance between the two stations be x km.
I. Then, speed of the mail train = (y + 12) km/hr.
II.\( \frac { X } { Y } \)\( \frac { X } {( Y+12 )} \)=\( \frac { 40} {60 }\)
Thus, even I and II together do not give x.
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