(b) Time period of satellite
$\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ T = 2\pi\sqrt{\frac{(R_{e} + h)^{2}}{gR_{e}^{2}}}$
$Where,\ \ R_{e} = Radius\ of\ earth,$
$\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ h = Height\ from\ earth\ surface\ .$
Time period not depend on mass. So, time period of both satellite will be equal.