I think this plane is flying much lower and slower. The B2s are based at Whiteman AFB, which is about 25 miles south of this photograph. The prevailing winds in this part of the country are from the south, so I suspect that it is about to turn onto the final leg of its approach for a landing to the south. I’d guess that it’s no more than 8-10K’ and traveling at a 2-300 knots max.
Definitely. Rule of thumb in a jet is to slow down if you're closer than 3x the altitude. So at 8k feet you want to be at least 24 nautical miles (27 normal miles) away or if closer you want to be slowing down (or descending). If you don't slow down before you're going to have to do so in the descend and typical jets can't really slow down much in that.
