(A) 10
(B) 18
(C) 36
(D) 72
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(A) 10
(B) 18
(C) 36
(D) 72
Answer: Option (C) 36
Explanation:
Let the speed of each train be x m/sec.
Then, relative speed of the two trains = 2x m/sec.
So, 2x = (120 + 120)/12
=> 2x = 20
=> x = 10.
Therefore Speed of each train = 10 m/sec = 10 x (18/5) km/hr = 36 km/hr.