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 16 hours and 9 hours respectively. The ratio of their speeds is?
Choose the correct answer:	A) 4 : 5	B) 4 : 3	C) 4 : 4	D) 4 : 9	E) 3 : 4

Rationale: "let us name the trains a and b . then , ( a ' s speed ) : ( b ' s speed ) = √ b : √ a = √ 9 : √ 16 = 3 : 4 answer : e"
Answer: E