The calculated distance (air line) between Tanushimarumachi-toyoki and Nakatsu is approximately 34 miles respectively 54 kilometers.
By car or train, the actual journey to Nakatsu is certainly longer, as only the direct route (as the crow flies) between Tanushimarumachi-toyoki and Nakatsu has been calculated here.
Air line (approximately)
54 kilometers
29 nautical miles