What is Main Purpose Of Chandrayaan-3 and How is  become helpful for us?? 

This is worksheet 3 from my NAT101 course. i need help with the questions pls 

What is the round-trip travel time of light from earth to Pluto (at a distance of 40 AU)? How far would a spacecraft moving in a circular orbit 500 km above Pluto's surface travel during that time? To how many orbits does this corresponds?

The Andromeda galaxy lies about 2.5 million light-years away. To what distance do the angular  resolutions of SST (3”), HST (0.05”), and a radio interferometer (0.001”) correspond at that distance?