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 36 hours respectively. The ratio of their speeds is?	Pick
A) 6:5	B) 6:3	C) 4:4	D) 4:8	E) 4:1
Let us name the trains A and B.   Then, (A's speed) : (6:3's speed)   = √b : √a = √36 : √9   = 6:3   Answer: 6:3
<result>B</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 9 hours and 36 hours respectively. The ratio of their speeds is?