MACH 10 = 7,000+ mph yet this device only has a range of 300 miles? If fired up for only 10 seconds its range would be well over 700 miles.
Your DEI math does not compute. At 7,000 mph, you would travel approximately 19.4 miles in 10 seconds.
correct - at 7,000 mph 19.44 miles in 10 seconds
AT Mach 10 ~7672 mph that’s 127.866 miles per minute