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 49 hours respectively. The ratio of their speeds is?	Pick one
A) 4:7  B) 7:3  C) 4:9  D) 4:4  E) 4:2
Let us name the trains A and B.   Then, (A's speed) : (7:3's speed)   = âˆšb : âˆša = âˆš49 : âˆš9 = 7:3.Answer: 7:3
<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 49 hours respectively. The ratio of their speeds is?