I'm a little unclear on one point: knowing that 3ms * 186000 miles/sec is roughly 550 miles, wouldn't the radius be ~275 miles? (Round trip travel time before t

I'm a little unclear on one point: knowing that 3ms * 186000 miles/sec is roughly 550 miles, wouldn't the radius be ~275 miles? (Round trip travel time before timeout) That is assuming that packets could actually travel that fast through a wire.