The Boeing 747 is a large, long-range, wide-body airliner designed and manufactured by Boeing Commercial Airplanes. It is known for its distinctive "hump" upper deck, which provides additional space for passengers or cargo. The Boeing 747 has undergone several improvements and updates since its introduction in 1969, resulting in different variants with varying performance characteristics.

The speed of a Boeing 747 depends on the specific variant and its operating conditions. Here are the typical cruise speeds for some common Boeing 747 variants:

1. Boeing 747-100/-200: Cruise speed approximately 570 mph (917 km/h or Mach 0.84).

2. Boeing 747-300/-400: Cruise speed approximately 614 mph (988 km/h or Mach 0.92).

3. Boeing 747-8: Cruise speed approximately 610 mph (982 km/h or Mach 0.85).

It's important to note that the actual speed of a Boeing 747 can vary depending on factors such as altitude, weather conditions, aircraft configuration, and operational requirements. Additionally, the speed mentioned here is the typical cruise speed, which may differ from takeoff, climb, descent, and landing speeds.

For the most accurate and up-to-date information on Boeing 747 speed, it's best to refer to the manufacturer's specifications, airline manuals, or flight operations data.