Need help will give brainlest
Describe a procedure you could use to separate the components of a mixture of sand, gravel, salt, and iron filings. Identify which component(s) would be separated at each step, and why.

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?