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
Explanation:
Let us name the trains as A and B. Then,
A's speed : B's speed = $ \sqrt{b} $ : $ \sqrt{a} $ = $ \sqrt{16} $ : $ \sqrt{9} $ = 4 : 3.