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 32 hours and 16 hours respectively. The ratio of their speeds is
Pick
A) 4 : 9  B) 4 : 3  C) 4 : 12  D) 1 : 2  E) 4 : 5
Let us name the trains as A and B. Then, (A's speed) : (B's speed) = b : a = 16 : 32 = 1 : 2.
Answer: 1 : 2
<result>D</result>
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 32 hours and 16 hours respectively. The ratio of their speeds is