A man of mass M stands at one end of a s...

A man of mass M stands at one end of a stationary plank of length L, lying on a smooth surface. The man walks to the other end of the plank. If the mass of the plank is `M//3`, the distance that the man moves relative to the ground is

`(3L)/4`

`L/4`

`(4L)/5`

`L/3`

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