A.  10

B.  12

C.  15

D.  20

1
Correct Answer :
12
Explanation :

Speed of the first train = (120/10) m/sec = 12 m/sec

Speed of the second train = (120/15) m/sec = 8 m/sec

Relative speed = (12 + 8) = 20 m/sec

=> Required time = [ (120 + 120) / 20 ] sec = 12 sec


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