In a solution, a board moving a velocity...

In a solution, a board moving a velocity `v hati` w.r.t. earh, while a man a is running with a velocity `2vhati` w.r.t. earth and the man B is running with a velocity `-2vhati` with respect to earth. Both men are running from the opposite ends of the board at the same time as shown. Lenght of the board is L and they meet after time T, then

value of T is L/4v

value of T is L/2v

displacement of man B w.r.t. board in time T is 3L/4

displacement of man B w.r.t. board in time T is L/4

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