Turtle and rabbit race

Mario Kart style.html

<script>
var Animal = function(s,f,n) {
  this.speed = s;
  this.focus = f;
  this.name = n;
  this.position = 0;
  this.report = function() {
    return this.name + " is at " + this.position;
  };
  this.run = function() {
    if(this.focus > (Math.random() * 10)) {
    this.position += this.speed;
    }
  };
  this.powerup1 = function() {
    if((Math.random() * 10) < 5) {
      this.speed ++;
    }
    else if (((Math.random() * 10) >=5) && ((Math.random() * 10) < 9)) {
      this.speed * 2;
    }
    else {
      this.speed --;
    }
  };
  this.powerup2 = function() {
    if((Math.random() * 10) < 5) {
      this.speed --;
    }
    else if (((Math.random() * 10) >=5) && ((Math.random() * 10) < 9)) {
      this.speed ++;
    }
    else {
      this.speed * 2;
    }
  };
}

var turtle = new Animal(2,8,"Beth");
var rabbit = new Animal(5,2,"David");

var distance = 50;

while(turtle.position < distance && rabbit.position < distance) {
  if (turtle.position >= 15 && turtle.position <17) {
    turtle.powerup1();
    turtle.run();
    //console.log(turtle.report);
  }
  else if (turtle.position >= 35 && turtle.position <37) {
    turtle.powerup2();
    turtle.run();
    //console.log(turtle.report);
  }
  else {
    turtle.run();
    //console.log(turtle.report);
  }
  if (rabbit.position >= 15 && rabbit.position <=20) {
    rabbit.powerup1();
    rabbit.run();
    //console.log(rabbit.report);
  }
  else if (rabbit.position >= 35 && rabbit.position <=40) {
    rabbit.powerup2();
    rabbit.run();
    //console.log(rabbit.report);
  }
  else {
    rabbit.run();
    //console.log(rabbit.report);
  }
}

console.log(turtle.report());
console.log(rabbit.report());
</script>