The train crosses two persons walking along a railway track. The first one walk at 12 km/hr in the direction of the train and the second person walk at 18 km/hr in the opposite direction of the train. The train needs 12 seconds and 6 seconds to cross them. What is the speed of the train?
1
42 km/hr
2
38 km/hr
3
44 km/hr
4
36 km/hr