The calculated distance (air line) between Sarny and Davyd-Haradok is approximately 56 miles respectively 90 kilometers.
By car or train, the actual journey to Davyd-Haradok is certainly longer, as only the direct route (as the crow flies) between Sarny and Davyd-Haradok has been calculated here.
Air line (approximately)
90 kilometers
49 nautical miles