The length of two train are 1000m and 2000 m, respectively. They are moving on the parallel tracks. When they are running in the same direction the faster train crosses the slower train in 1/3 minute. When they are running in opposite direction at speed same as their earlier speeds, they pass each other completely in 1/6 minute. Then, find the speed of the slower train?

1
60 m/s
2
75 m/s
3
72 m/s
4
80 m/s
5
None of these

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