2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/34292The relations for G-dot in multidimensional model with Ricci-flat internal space and multicomponent perfect fluid are obtained. A two-component example: dust + 5-brane, is considered.5 pages, Latex, subm. to Proc. of Int. Workshop in Waseda UnivGeneral Relativity and Quantum Cosmologytext