Two trains A and B start simultaneously in the opposite direction from two points A and B arrive at their destinations 9 and 4 hours respectively after their meeting each other. At what rate dose the second train B travels if the first train travels at 80 km per hour. Option  Pick
A) 60 km/h
B) 100 km/h
C) 120 km/h
D) 80 km/h
E) 90 km/h
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.   hence the answer 120 km/hr   ANSWER:120 km/h
<result>C</result>
Two trains A and B start simultaneously in the opposite direction from two points A and B arrive at their destinations 9 and 4 hours respectively after their meeting each other. At what rate dose the second train B travels if the first train travels at 80 km per hour. Option