The calculated distance (air line) between Piton Saint-Leu and Sainte-Rose is approximately 32 miles respectively 51 kilometers.
By car or train, the actual journey to Sainte-Rose is certainly longer, as only the direct route (as the crow flies) between Piton Saint-Leu and Sainte-Rose has been calculated here.
Air line (approximately)
51 kilometers
27 nautical miles