A.  9

B.  18

C.  36

D.  72

1
Correct Answer :
36
Explanation :

Let the speed of each train be x m/sec.

Then, relative speed of the two trains = 2x m/sec

=> 2x = [ (120 + 120) / 12 ]

=> x = 10

=> Speed of each train = 10 m/sec = 10 x (18/5) km/hr = 36 km/hr


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