The thermal conductivity parallel to continuous reinforcing fibers in a composite with E-glass in a matrix of polyester is found to be 0.65 W/m.K. The thermal conductivity of E-glass is 0.97 W/m.K and that of the polyester is 0.17 W/m.K. All the given values are for room temperature. Find the volume fraction of the E-glass fiber in the composite.