The fastest spacecraft ever launched. The New Horizons mission to Pluto had a long way to travel: about 40AU. Even though it's traveling at an average speed of about 20 km/sec, it took years to get there.
a) About how far did it travel to Pluto in kilometers?
b) How long did it take, in years? (Do a calculation)
c) From there, how long did its radio signal take to reach Earth, traveling at the speed of light (3x108 m/s)?