A train of length 150 meters takes 10 seconds to pass over another train 100 meters long coming from the opposite dirction. If the speed of the first train is 30 km/hr. The speed of the second train is ___.
A train of length 150 meters takes 10 seconds to pass over another train 100 meters long coming from the opposite dirction. If the speed of the first train is 30 km/hr. The speed of the second train is ___.