The takeoff speed of planes can vary significantly depending on several factors, including the type of aircraft, its weight, the length of the runway, and the prevailing weather conditions. Generally, commercial jet airliners have takeoff speeds ranging from around 130 knots (150 mph or 240 km/h) to 180 knots (210 mph or 335 km/h).
However, it's important to note that these speeds are given in terms of indicated airspeed (IAS), which measures the speed of the aircraft relative to the surrounding air. Indicated airspeed is affected by factors such as altitude, air density, and aircraft configuration. The true ground speed during takeoff, which factors in wind conditions, will be different.
Additionally, smaller aircraft, such as general aviation planes, may have lower takeoff speeds, typically ranging from around 55 knots (63 mph or 102 km/h) to 80 knots (92 mph or 148 km/h).
It's worth mentioning that these figures are approximate and can vary depending on specific aircraft models and conditions. Pilots rely on performance charts and operating manuals specific to the aircraft they are flying to determine the appropriate takeoff speeds for a given situation.