The speeds of two trains are in the ratio 5 : 9. They are going in opposite directions along parallel tracks. If each takes 5 seconds to cross a telegraph post, find the time taken by the trains to cross each other completely?(CTS COMPANY)

The speeds of two trains are in the ratio 5 : 9. They are going in opp

1.	The speeds of two trains are in the ratio 5 : 9. They are going in opposite directions along parallel tracks. If each takes 5 seconds to cross a telegraph post, find the time taken by the trains to cross each other completely?(CTS COMPANY)
A.	5 sec
B.	3 sec
C.	9 sec
D.	6 sec
Answer» B. 3 sec