Good grief! Read the story!
They exceed Mach 3.5 (2650 mph) and 80,000 ft.
Good grief, do the math.
I DID read the story and they gave their max speed as 1.6 miles / second. I even pulled the quote for my post. Who peed in your cornflakes this AM?
1.6 mi/sec x 60 sec/min x 60 min/hr = 5760 miles/hr. 5760 mph / 741.4549 mph/mach = 7.76851 mach. But then again, it is a complex nonlinear relationship. Hey, they report, I calculate, we decide. Too fast for the airframe? Probably. But I'll bet that if ask "so how fast were you going, about warp factor 1?" I'd get a "foxtrot yankee"