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Discussion :: Time and Distance

1. 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.

2. 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 :

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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