Two trains approaching each other crosses a girl standing on the platform in 33 seconds and 23 seconds respectively. They cross each other in 29 seconds and speed of the first train is 15m/s. Then find the speed of the other train.

1
12 m/s.
2
15 m/s.
3
20 m/s.
4
10 m/s.
5
8 m/s.

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