Probability distribution of the ratio of spin to orbital angular velocity for the mass donor (left panel) and the mass accreting star (right panel) in our models during the semi-detached configuration, weighted by the birth probability of each system and the lifetime in the respective bin. The colour coding indicate the initial orbital period ranges indicated in the legend. The coloured vertical lines at the top of the right plot indicate the ratio of spin to orbital angular velocity of some of the observed massive Algol binaries where both parameters were found in the literature (Table 3). The Y-axis of the right panel is in log scale.