The calculated distance (air line) between Nay Pyi Taw and Myanaung is approximately 114 miles respectively 183 kilometers.
By car or train, the actual journey to Myanaung is certainly longer, as only the direct route (as the crow flies) between Nay Pyi Taw and Myanaung has been calculated here.
Air line (approximately)
183 kilometers
99 nautical miles