The calculated distance (air line) between Duayaw-Nkwanta and Koforidua is approximately 147 miles respectively 236 kilometers.
By car or train, the actual journey to Koforidua is certainly longer, as only the direct route (as the crow flies) between Duayaw-Nkwanta and Koforidua has been calculated here.
Air line (approximately)
236 kilometers
127 nautical miles