To arrange the routes in increasing order of distance, we need to compare each route's distance and then list them from the shortest to the longest.
Here are the distances given for each route:
Route 1: 1199 km
Route 2: 1121 km
Route 3: 1185 km
Route 4: 1115 km
Let's arrange these distances in increasing order:
Route 4: 1115 km
Route 2: 1121 km
Route 3: 1185 km
Route 1: 1199 km
So, the routes in increasing order of distance are: Route 4, Route 2, Route 3, and Route 1.