It's about as fast as a Lamborghini Gallardo.
It's about as fast as The TGV (train).
In other words, the speed of The TGV (train) is 1 times 0.260 mach.(Train à Grande Vitesse) (for SNCF TGV Réseau, a.k.a. "Network" model, a.k.a. TGV-R) (maximum speed)
The TGV Réseau sets have a top speed of 0.270 mach. The train is capable of travelling the 425 km (264 mi) distance from Paris to Lyon in East-Central France in about two hours.
It's about as fast as an Arrow (archery).
In other words, the speed of an Arrow (archery) is 1.04 times 0.260 mach.(250 g arrow fired from 60#/28" bow)
A 250 gram arrow will reach speeds of approximately 0.27040 mach when fired from a 60-lb, 28-inch draw bow . Archeological evidence from the Ahrensburg valley near Hamburg, Germany indicates that arrows have been used since at least 11 to 12,000 years ago.
It's about nine-tenths as fast as a Porsche 911.
It's about one-and-one-tenth times as fast as a Helicopter.
In other words, 0.260 mach is 1.09 times the speed of a Helicopter, and the speed of a Helicopter is 0.9170 times that amount.(for AH-64A Apache, a.k.a. Hughes Model 77) (maximum cruise speed)
The AH-64 helicopter, one of the primary helicopters used by the United States Army, flies at a top cruise speed of 0.2380 mach. The AH-64 is the primary military helicopter of several nations including the United States, the United Kingdom, Israel, Japan, and the Netherlands.
It's about nine-tenths as fast as The CRH (train).
In other words, 0.260 mach is 0.890 times the speed of The CRH (train), and the speed of The CRH (train) is 1.10 times that amount.(a.k.a. Hexie Hao, 和谐号, a.k.a. 和諧號, a.k.a. Héxié Hào, a.k.a. "Harmony")
The CRH-3 train which runs on China's Beijing-Tianjin Intercity Railway are capable of speeds up to 0.290 mach. Theses train can make the 120 km (74 mi) journey from Beijing to Tianjin in about 30 minutes.
It's about one-and-one-fifth times as fast as a Skydiver (headfirst).
In other words, the speed of a Skydiver (headfirst) is 0.830 times 0.260 mach.(Head-to-Earth orientation or standing, average conditions, terminal velocity)
A head-to-Earth or standing-oriented skydiver's terminal velocity assuming average conditions is about 0.220 mach. In a typical jump from 3,900 m (13,000 ft), a diver in this orientation will be in freefall for 46 seconds.