Two trains, one from Howrah to Patna and the other from Patna to Howrah, start simultaneously. After they meet, the trains reach their destinations after 9 hours and 16 hours respectively. The ratio of their speeds is:

2 : 3
4 : 3
6 : 7
9 : 16

Correct Answer: 4 : 3

Explanation:

Let us name the trains as A and B. Then,

(A's speed) : (B's speed) = √b : √a = √16 : √9 = 4 : 3.

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