The calculated distance (air line) between Tanushimarumachi-toyoki and Iizuka is approximately 20 miles respectively 32 kilometers.
By car or train, the actual journey to Iizuka is certainly longer, as only the direct route (as the crow flies) between Tanushimarumachi-toyoki and Iizuka has been calculated here.
Air line (approximately)
32 kilometers
17 nautical miles