Question

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 necessary to answer.

Answer 1

The correct option is D Both I and II are necessary to answer.

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
$(\frac{4}{3}\times 36)$
= 48 min.
Thus, I and II together give the Ans.
$\therefore$ Correct Ans is (D).