Can someone name a single solved philosophical problem? Okay so, I don't take science to be a part of philosophy. I don't much care if a good deal of philosophising was done on what are presently scientific questions, and I don't care that many a philosopher was also a scientist.
Philosophy is generally theoretical, and I think its main branches are metaphysics, logic, epistemology, axiology and aesthetics. Problems which exist within these domains can justly (as far as I am concerned) be considered philosophical. Problems which are of the form 'How does 'x' occur' and 'Why does 'x' occur' where x is any natural phenomena are scientific. If you don't agree with this schema that's okay, but can you answer the original question with the assumption that it's correct.