-Speed of a common snail = 0.001 ms-1; 0.0036 km/h; 0.0023 mph. -A brisk walk = 1.667 ms-1; 6 km/h; 3.75 mph. -Olympic sprinters (average speed over 100 metres) = 10 ms-1; 36 km/h; 22.5 mph. -Speed limit on a French autoroute = 36.111 ms-1; 130 km/h; 80 mph. -Top cruising speed of a Boeing 747-8 = 290.947 ms-1; 1047.41 km/h; 650.83 mph; (officially Mach 0.85) -Official air speed record = 980.278 ms-1; 3,529 km/h; 2,188 mph. -Space shuttle on re-entry = 7,777.778 ms-1; 28,000 km/h; 17,500 mph. the speed of sound in air (Mach 1) is about 340 ms-1, and 1500 ms-1 in water -Taipei 101 Observatory Elevator = 1010 m/min ; 16.667 ms-1 ; 60.6 km/h; 37.6 mph