The calculated distance (air line) between Kamianets-Podilskyi and Dersca is approximately 51 miles respectively 82 kilometers.
By car or train, the actual journey to Dersca is certainly longer, as only the direct route (as the crow flies) between Kamianets-Podilskyi and Dersca has been calculated here.
Air line (approximately)
82 kilometers
44 nautical miles