✨ Add day 12 part 1

day_12/Velocity.php

@@ -0,0 +1,75 @@
+<?php
+
+class Velocity
+{
+    protected $x;
+    protected $y;
+    protected $z;
+
+    /**
+     * Velocity constructor.
+     * @param $x
+     * @param $y
+     * @param $z
+     */
+    public function __construct($x, $y, $z)
+    {
+        $this->x = $x;
+        $this->y = $y;
+        $this->z = $z;
+    }
+
+    /**
+     * @return mixed
+     */
+    public function getX()
+    {
+        return $this->x;
+    }
+
+    /**
+     * @param mixed $x
+     * @return Velocity
+     */
+    public function setX($x)
+    {
+        $this->x = $x;
+        return $this;
+    }
+
+    /**
+     * @return mixed
+     */
+    public function getY()
+    {
+        return $this->y;
+    }
+
+    /**
+     * @param mixed $y
+     * @return Velocity
+     */
+    public function setY($y)
+    {
+        $this->y = $y;
+        return $this;
+    }
+
+    /**
+     * @return mixed
+     */
+    public function getZ()
+    {
+        return $this->z;
+    }
+
+    /**
+     * @param mixed $z
+     * @return Velocity
+     */
+    public function setZ($z)
+    {
+        $this->z = $z;
+        return $this;
+    }
+}