A bomb of mass 3m is kept inside a close...

A bomb of mass `3m` is kept inside a closed box of mass `3m` and length `4L` at its centre. It explodes in two parts of mass `m` and `2m`. The two parts move in opposite directions and stick to the opposite sides of the walls of box. The box is kept on a smooth horizontal surface. What is the distance moved by the box during this time interval.

`L/6`

`L/12`

`L/3`

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