The calculated distance (air line) between Sinmak and P’yŏngsŏng is approximately 61 miles respectively 97 kilometers.
By car or train, the actual journey to P’yŏngsŏng is certainly longer, as only the direct route (as the crow flies) between Sinmak and P’yŏngsŏng has been calculated here.
Air line (approximately)
97 kilometers
53 nautical miles