The wind speeds of a tornado will vary from tornado to tornado and depend on the scale of the tornado.
An F0 tornado which is known as Gale Tornado has wind speeds of 40 to 72 MPH.
An F4 Tornado which is a devastating Tornado has wind speeds of 207 to 206 MPH.
An F5 Tornado that's classified as an incredible Tornado has wind speeds of 261 to 318 MPH.
An F6 Tornado which is an inconceivable Tornado has wind speeds of 319 to 379 MPH.
Tornado's are very dangerous and can do a huge amount damage including killing people and animals so always take shelter when there's a tornado warning.