There are two trains running on two parallel tracks. Length of each train is 120 m. When they are running in opposite directions, they cross each other in 4 seconds and when they are running in the same direction they cross in 12 seconds. What is the speed of the faster train?

1)80 km/h

2)72 km/h

3)120 km/h

4)144 km/h

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    144 km/h

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