Can some one be my bff?/ best friend forever fyi im not poor

According to an observer on earth, planet x is stationary. maria and samir depart earth on their spaceships at the same time, each flying at 0.5c. maria flies toward planet x and samir flies in the opposite direction. according to maria, her voyage to planet x takes 9 years. how many years does maria's voyage take according to samir?

Is a copper wire a conductor or insulator?

If frequency goes down, what happens to wavelength? does it get shorter or longer?