a railway porter whose weight is w carries a suitcase w, on his head. he has to carry the weight from platform ‘2’to the exit gate on the side of platform ‘1’. he has to first traverse a horizontal path on platform ‘2’then climb the stairs on the over bridge side of platform ‘2’, walk horizontally on the over bridge, gets down along the stairs on the over bridge side of platform 1 and again traverse a horizontal path of platform ‘1’to the exit gate.
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