A shell of mass M is fired as shown on the figure, at the top of its trajectory; the shell explodes into two fragments.

A shell of mass M is fired as shown on the figure, at the top of its trajectory; the shell explodes into two fragments. One fragment, whose mass is M/3 has horizontal speed to the left after the explosion, falls as shown, 250 m from the launching site. How far from the launch site would the other fragment of mass 2M/3 falls? Ignore all friction and drag forces.