title: How to move multiple turtles at the same time?
body: <p>I have an assignment which is asked to set two turtles in a race track (same size but separate track). I am able to make them move, but the second one moves only when the first one moved a half of the track. I'm not sure how to make the turtles move at the same time. Here is my code:</p>
  <pre><code>import turtle
  import random
  import time
  
  wn = turtle.Screen()
  wn.bgcolor(&quot;lightgreen&quot;)
  
  t = turtle.Turtle()
  t.shape('turtle')
  t.color('red')
  
  t2 = turtle.Turtle()
  t2.shape('turtle')
  t2.color('blue')
  
  #user input function
  
  p = float(input('please insert the perimeter:'))
  
  #set the track
  def drawTrack(p,r):
      shortside = (p/2.0)/(r+1)
      longside = r*shortside
      turtle.setup((shortside*2)+60, longside +40)
      t.penup()
      t2.penup()
      t.setposition(-shortside-10, -longside/2)
      t2.setposition(10, -longside/2)   
      for i in range (2):
          #first track
          t.speed(1)
          t.pendown()
          t.forward(shortside)
          t.left(90)
          t.forward(longside)
          t.left(90)
          
          #second track
          t2.speed(1)
          t2.pendown()
          t2.forward(shortside)
          t2.left(90)
          t2.forward(longside)
          t2.left(90) 
  
  drawTrack(p,2)
  
  wn.exitonclick()
  </code></pre>