Discussion :: Time and Distance

How much time did X take to reach the destination?
I.
The ratio between the speed of X and Y is 3 : 4.
II.
Y takes 36 minutes to reach the same destination.
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 E
Explanation :
Since ratio of speed of X : Y is 3 : 4, then ratio of time will be 4 : 3.
I. If Y takes 3 min, then X takes 4 min.
II. If Y takes 36 min, then X takes\([\frac {4 } { 3 }*36]\)min= 48min
Thus, I and II together give the answer.
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