fix minute-overflow bug in clock formatted times

backend/app/get_travel_time.py

@@ -20,7 +20,7 @@ def timeFormat(seconds):
         'seconds': round(seconds,3),
         'minutes': round(seconds/60,3),
         # format travel times in seconds like a clock for humans to read
-        'clock': f'{math.floor(seconds/3600):02d}:{math.floor(seconds/60):02d}:{round(seconds%60):02d}'
+        'clock': f'{math.floor(seconds/3600):02d}:{math.floor((seconds/60)%60):02d}:{round(seconds%60):02d}'
     }
 
 def get_travel_time(start_node, end_node, start_time, end_time, start_date, end_date, include_holidays, dow_list):