If the universe is expanding at 73 kilometers per second per megaparsec, what is the fastest expansion speed that we can observe from Earth? I'm assuming that's the edge of the observable universe since that's the furthest point from Earth. Couldn't find anything so my calculations say 3.47c, going with the (73 km/s)/mpc, but I wanted to verify.
Radius of 46.5 billion light years converted to megaparsecs = 14,257. Multiply that by 73 gets you 1,040,761 km/s. Divide by 300,000 km/s gets you 3.47c