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..5cf6291 100644
--- a/src/index.js
+++ b/src/index.js
@@ -1,24 +1,106 @@
-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);
-  });
-}
-
-const menu = {
-  hamburger: 'Combo Hamburguesa',
-  hotdog: 'Combo Hot Dogs',
-  pizza: 'Combo Pizza',
-};
-
-const table = ['Mesa 1', 'Mesa 2', 'Mesa 3', 'Mesa 4', 'Mesa 5'];
-
-const waiter = () => {
-  orders(6000, menu.hamburger, table[3])
-    .then((res) => console.log(res))
-    .catch((err) => console.error(err));
-};
-
-waiter();
+
+    let  XMLHttpRequest = require('xmlhttprequest').XMLHttpRequest;
+    const API = 'https://us-central1-escuelajs-api.cloudfunctions.net/orders/';
+            fetchOrders=(url_api)=>{
+            return new Promise((resolve, reject)=>{
+                let xhttp= new XMLHttpRequest();
+                xhttp.open('GET', url_api, true)
+                xhttp.onreadystatechange= function (event){
+                if(xhttp.readyState===4){
+                (xhttp.status===200)
+                    ? resolve(JSON.parse(xhttp.responseText))
+                    :reject(new Error('Error', url_api))
+                }
+            };
+        
+        xhttp.send();
+    });
+    
+    }
+    //### Primer problema
+    const min = 1000;
+    const max = 8000;
+    const randomTime = () => {
+      return Math.round(Math.random() * (max - min)) + min;
+
+    }
+        const orders = (time, product, table) => {
+        console.log(`### Orden: ${product} para ${table}`);
+        return  new Promise((resolve, reject)=>{
+          setTimeout(()=>{
+          if(randomTime(max, min) <= time){   
+                    resolve(`=== Pedido servido: ${product}, tiempo de preparación ${time}ms para la ${table}`);
+        } else {
+            reject(new Error(Error));
+            }
+          
+          }, time);  
+      });
+    }
+
+    const menu = {
+      hamburger: 'Combo Hamburguesa',
+      hotdog: 'Combo Hot Dogs',
+      pizza: 'Combo Pizza',
+    };
+
+    const table = ['Mesa 1', 'Mesa 2', 'Mesa 3', 'Mesa 4', 'Mesa 5'];
+
+
+    const waiter = () => {
+      orders(6000, menu.hamburger, table[3])
+        .then((res) => console.log(res))
+        .catch((err) => console.error(err));
+    }
+
+    //### Segundo Problema  
+    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.hotdog, table[1])
+
+        console.log(order1)
+        console.log(order2)
+        console.log(order3)
+
+      } catch (error) {
+        console.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(`pedido1: ${order1.data}`)
+        console.log(`pedido2: ${order2.data}`)
+        console.log(`pedido3: ${order3.data}`)
+        console.log(`pedido4: ${order4.data}`)
+
+      }  catch(error){
+        console.error(error)
+    }
+    };
+
+    
+    waiter()
+    waiter2()
+    waiter3()
+    waiter4(API)
\ No newline at end of file