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Our analysis of available and new multicolour light curves of the southern Algol-type binaries RW CrA and DX Vel allowed to determine their absolute parameters and classify them as detached and semidetached system, respectively. The times of primary eclipses of both binaries were used to construct eclipse time variation (ETV) diagrams and interpret them by a light-time effect. We determined the periods of their highly eccentric third body orbits to be 37.2 years for RW CrA and 78.9 years for DX Vel.