Two blocks of mass \( 20\,\text{kg} \) and \( 30\,\text{kg} \) are placed in contact on a smooth horizontal surface. A force \( F = 60\,\text{N} \) is applied to the \( 20\,\text{kg} \) block. Find the force exerted by the \( 20\,\text{kg} \) block on the \( 30\,\text{kg} \) block.