A ball is projected so that its horizontal range is 45 metres and it passes through a point 22.5 metres horizontally from and 11.25m vertically above the point of projection. Find the angle of projection and the speed of projection. Assume g = 10m/s/s and no air resistance.
I know i should be able to do this, but I can't seem to be able to progress beyond this point in my working.

I have almost zero physics knowledge and trying to approach this from a calculus and simultaneous equations approach.

thanks in advance

jacs