Two trains started at the same time, one from A to B and the other from B to A . If they arrived at B and A respectively 4 hours and 9 hours after they passed each other the ratio of the speeds of the two trains was :

Answer: (b)

Note : If two trains (or bodies) start at the same time from points A and B towards each other and after crossing they take a and b sec in reaching B and A respectively, then: (A's speed) : (B's speed)

= (b : a)

Therefore, Ratio of the speeds of two trains = \(\sqrt{9} : \sqrt{4}\)

= 3 : 2