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Two men 'A' and 'B' are standing on a pl...

Two men `'A'` and `'B'` are standing on a plank. `'B'` is at the middle of the plank and `'A'` is at the left end of the plank. Lower surface of the plank is smooth. System is initially at rest and masses are as shown in Fig. `'A'` and `'B'` start moving such that the position of `'B'` remains fixed with respect to ground, then `'A'` meets `'B'`. Then the point where `A` meets `B` is located at

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