Discussion :: Time and Distance

Two cars pass each other in opposite direction. How long would they take to be 500 km apart?
I.
The sum of their speeds is 135 km/hr.
II.
The difference of their speed is 25 km/hr.
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 
Answer : Option A
Explanation :
I gives, relative speed = 135 km/hr.
Time taken =\( \frac { 500 } { 135 } \)hrs
II does not give the relative speed.
I alone gives the answer and II is irrelevant.
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