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