My computer connection is hard wired by an ethernet cable to my router but there may be, for those using it, a relationship between speed and WiFi as this BBC report suggests.
17Mb down and 1Mb up. Far end of queens road. Rock solid, my links uptime has recently reached 2 months.
The age and even what material your line is made out of make as much difference as length. There was a period in the past when phone lines were made out of an aluminum alloy. Because its cheap. If you've got one of those in your path. Good luck ever getting more than a couple of Mb.
Really bandwidth is not the most important metrics for speed of your line anyway.
What you should really care about is the latency, as that is what affects the responsiveness of the connection.
If bandwidth is the number of lanes on your highway. Latency is a side effect of the amount of traffic traveling down those roads. Does not matter how fast it is, if you spend half your time waiting for the packets to travel back and forth.
10ms is a good figure to a European destination on a clean line. Much more than that is a sign of being buffered.