Correct Answer: Option C
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.
So, Speed of each train = 10 m/sec
= (10 x (18/5)) km/hr = 36 km/hr
Download our app for free and access thousands of MCQ questions with detailed solutions