Two trains are moving on parallel rails in opposite directions: the first has speed \(5~\mbox{m/s}\) and the second has speed \(7~\mbox{m/s}\). A boy in the second train tosses a ball towards a boy in the first train at the moment they are facing each other. How fast should the first boy run **in m/s** with respect to the first train so that he can catch the ball?

**Details and assumptions**

- Neglect the effects of gravity.

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