diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000..c90c067
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,13 @@
+{
+  "name": "escuelajs-reto-04",
+  "version": "1.0.0",
+  "lockfileVersion": 1,
+  "requires": true,
+  "dependencies": {
+    "xmlhttprequest": {
+      "version": "1.8.0",
+      "resolved": "https://registry.npmjs.org/xmlhttprequest/-/xmlhttprequest-1.8.0.tgz",
+      "integrity": "sha1-Z/4HXFwk/vOfnWX197f+dRcZaPw="
+    }
+  }
+}
diff --git a/package.json b/package.json
index bf060d5..0abd8ad 100644
--- a/package.json
+++ b/package.json
@@ -20,5 +20,8 @@
   "bugs": {
     "url": "https://github.com/platzi/escuelajs-reto-04/issues"
   },
-  "homepage": "https://github.com/platzi/escuelajs-reto-04#readme"
-}
\ No newline at end of file
+  "homepage": "https://github.com/platzi/escuelajs-reto-04#readme",
+  "dependencies": {
+    "xmlhttprequest": "^1.8.0"
+  }
+}
diff --git a/src/index.js b/src/index.js
index 4c965e7..892a909 100644
--- a/src/index.js
+++ b/src/index.js
@@ -1,9 +1,38 @@
+const XMLHttpRequest = require("xmlhttprequest").XMLHttpRequest;
+const API = "https://us-central1-escuelajs-api.cloudfunctions.net/orders";
+const xhttp = new XMLHttpRequest();
+
+const statusCompleted = 4
+const statusSuccessful = 200
+
+const fetchOrders = url_api => {
+  return new Promise((resolve, reject) => {
+    try {
+      xhttp.open('GET', url_api, false)
+      xhttp.onreadystatechange = (event) => {
+        if(xhttp.readyState === statusCompleted) {
+          if(xhttp.status === statusSuccessful) {
+            resolve(JSON.parse(xhttp.responseText))
+          }
+        }
+      }
+    } catch (error) {
+      reject(`Ha ocurrido un Error ${error}`)
+    }
+    xhttp.send();
+    })
+  }
+
 const orders = (time, product, table) => {
   console.log(`### Orden: ${product} para ${table}`);
   return new Promise((resolve, reject) => {
-    setTimeout(() => {
-      resolve(`=== Pedido servido: ${product}, tiempo de preparación ${time}ms para la ${table}`);
-    }, time);
+    try {
+      setTimeout(() => {
+        resolve(`=== Pedido servido: ${product}, tiempo de preparación ${time}ms para la ${table}`);
+      }, time);
+    } catch (error) {
+      reject(`Ha ocurrido un Error ${error}`)
+    }
   });
 }
 
@@ -15,10 +44,70 @@ const menu = {
 
 const table = ['Mesa 1', 'Mesa 2', 'Mesa 3', 'Mesa 4', 'Mesa 5'];
 
+const randomTime = () => {
+  const timeMin = 1000
+  const timeMax = 8000
+
+  const numAleatorio = Math.floor(Math.random() * (timeMax - timeMin)) + timeMin;
+  return numAleatorio
+}
+
 const waiter = () => {
   orders(6000, menu.hamburger, table[3])
     .then((res) => console.log(res))
     .catch((err) => console.error(err));
 };
 
+const waiter2 = () => {
+  orders(randomTime(), menu.hotdog, table[0])
+    .then((res) => {
+      console.log(res)
+      return orders(randomTime(), menu.pizza, table[2])
+    })
+    .then((res) => console.log(res))
+    .catch((err) => console.error(err));
+};
+
+const waiter3 = async () => {
+  try {
+    const order1 = await orders(randomTime(), menu.hotdog, table[1])
+    const order2 = await orders(randomTime(), menu.pizza, table[1])
+    const order3 = await orders(randomTime(), menu.hamburger, table[1])
+    console.log(order1)
+    console.log(order2)
+    console.log(order3)
+
+  } catch (error) {
+    console.log(`Ha ocurrido un Error ${error}`)
+  }
+};
+
+const waiter4 = async () => {
+  try {
+    console.log('Solicitando Pedidos...')
+    const order1 = await fetchOrders(API)
+    const order2 = await fetchOrders(API)
+    const order3 = await fetchOrders(API)
+    const order4 = await fetchOrders(API)
+
+    console.log(`=== Pedido servido: ${order1.data}`)
+    console.log(`=== Pedido servido: ${order2.data}`)
+    console.log(`=== Pedido servido: ${order3.data}`)
+    console.log(`=== Pedido servido: ${order4.data}`)
+
+  } catch (error) {
+    console.log(`Ha ocurrido un Error ${error}`)
+  }
+};
+
+//Primer Problema
 waiter();
+
+//Segundo Problema
+waiter2();
+
+//Tercer Problema
+waiter3();
+
+//Cuarto Problema - API
+waiter4();