about two o'clock
inquired the Very Young Man . The Doctor smiled at him quietly . `` Rogers 's note put it about twelve thousand , '' he answered . `` It should reach that depth and stop about '' -- he hesitated a moment , calculating -- `` about two o'clock , '' he finished . `` Some climb , '' commented the Very Young Man . `` We could do this a lot better than we 're doing it , I think . '' For some time they sat in silence .