Q.
A. 2 : 3
B. 4 : 3
C. 6 : 7
D. 9 : 16
E. None of the above
Correct choice: B
Explanation:
Let us name the trains as A and B. Then,
(A's speed) : (B's speed) = b : a = 16 : 9 = 4 : 3.