Physics Rotational Mechanics Level: Misc Level

Two astronauts each having a mass of 75 kg are connected by a 10 m rope of negligible mass. They are isolated in space, moving in circles around the point halfway between them at a speed of 5 m/s. Treating the astronauts as particles. Calculate the magnitude of angular momentum, the rotational energy of the system.(By pulling on the rope the astronauts shorten the distance between them to 5 m) what is the new angular momentum of the system. what are their new speeds, what is the new rotational energy of the system,how much work is done by the astronauts in shorting the rope?