What is Landspeed of a airplane at take off?

This varies greatly from airplane to airplane, as well as according to ground wind conditions.

Keep in mind that landspeed does not matter to an airplane nearly as much as AIRspeed. For example, your typical 4-seater single engine airplane takes off at around 60mph airspeed. Given a 20mph headwind, this aircraft could take off at 40mph GROUND speed.

If you are interested in how fast the ground is wizzing by when youre looking out the window of the airliner. Most airliners take off at around 150 to 180 mph AIRspeed.