The calculated distance (air line) between Pyetrykaw and Svyetlahorsk is approximately 63 miles respectively 102 kilometers.
By car or train, the actual journey to Svyetlahorsk is certainly longer, as only the direct route (as the crow flies) between Pyetrykaw and Svyetlahorsk has been calculated here.
Air line (approximately)
102 kilometers
55 nautical miles