Any two or more housing authorities may join or cooperate with one another in the exercise, either jointly or otherwise of any or all of their powers for the purpose of financing (including the issuance of bonds, notes or other obligations and giving security therefor), planning, undertaking, owning, constructing, operating or contracting with respect to a housing project or projects located within the area of operation of any one or more of such authorities. For such purpose any authority may by resolution prescribe and authorize any other housing authority or authorities, so joining or cooperating with it, to act on its behalf with respect to any or all of such powers. Any authorities joining or cooperating with one another may by resolutions appoint from among the commissioners of such authorities an executive committee with full power to act on behalf of such authorities with respect to any or all of their powers, as prescribed by resolutions of such authorities.