The calculated distance (air line) between Svyetlahorsk and Byalynichy is approximately 94 miles respectively 152 kilometers.
By car or train, the actual journey to Byalynichy is certainly longer, as only the direct route (as the crow flies) between Svyetlahorsk and Byalynichy has been calculated here.
Air line (approximately)
152 kilometers
82 nautical miles