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? Select the correct option
A) 2 : 3  B) 4 : 3  C) 6 : 7  D) 9 : 16  E) 5 : 2

Rationale: "answer : option b let us name the trains a and b . then , ( a ' s speed ) : ( b ' s speed ) = â ˆ š b : â ˆ š a = â ˆ š 16 : â ˆ š 9 = 4 : 3"
Answer: B