In a snowball fight, you need to hit two targets that are crawling on the ground with a height of $0\mathrm{.}5$ meters that are $2\mathrm{.}5$ meters and $4$ meters directly in front of you. If you always throw your snow balls at an angle of $30$ ⁰ from horizontal and height of $1$ meter 

above the ground, at what speed must you throw your next two snowballs?