Two particles are projected simultaneously from two points \( O \) and \( O^{\prime} \) such tha...

Two particles are projected simultaneously from two points \( O \) and \( O^{\prime} \) such that \( 10 \mathrm{~m} \) is the horizontal and \( 5 \mathrm{~m} \) is the vertical distance between them as shown in the figure. They are projected at the same inclination \( 60^{\circ} \) to the horizontal with the same velocity \( 10 \mathrm{~ms}^{-1} \). Find the time (in sec) after which their separation becomes minimum.