The calculated distance (air line) between Trois-Rivières and Petit-Bourg is approximately 15 miles respectively 25 kilometers.
By car or train, the actual journey to Petit-Bourg is certainly longer, as only the direct route (as the crow flies) between Trois-Rivières and Petit-Bourg has been calculated here.
Air line (approximately)
25 kilometers
13 nautical miles