DONE

mbta.rb

@@ -1,5 +1,49 @@
-
+red_line = ["South Station",
+            "Park Street",
+            "Kendall",
+            "Central",
+            "Harvard", 
+            "porter", 
+            "Davis", 
+            "Alewife"]
+green_line = ["Goverment Center",
+            "Park Street",
+            "Boylston",
+            "Arlington",
+            "Copley", 
+            "Hynes", 
+            "Kenmore"]
+orange_line = ["North Station",
+            "Haymarket",
+            "Park Street",
+            "State",
+            "Downtown Crossing", 
+            "Chinatown", 
+            "Back Bay",
+            "Forst Hills"]
 # your solution here
-def stops_between_stations
+def stops_between_stations(startLine, startStation, endLine, endStation)
+    # stops = 0
+    if startLine == endLine
+        stops = (startLine.index(startStation) - startLine.index(endStation)).abs
+        puts stops
+        if startLine.index(startStation) > startLine.index(startStation)
+            for i in startLine.index(startStation)..startLine.index(endStation)
+                puts startLine[i]
+            end
+        else
+            for i in startLine.index(endStation)..startLine.index(startStation)
+                puts startLine[i]
+            end
+        end
+    else 
+        start = (startLine.index(startStation) - startLine.index("Park Street")).abs
+        final = (endLine.index(endStation) - endLine.index("Park Street")).abs
+        stops = (start - final).abs
+        puts stops
+    end
+end
 
-end
+stops_between_stations red_line, 'Alewife', red_line, 'Alewife'
+stops_between_stations red_line, 'Alewife', red_line, 'South Station' 
+stops_between_stations red_line, 'South Station', green_line, 'Kenmore'