The calculated distance (air line) between Janowiec Wielkopolski and Śródmieście is approximately 153 miles respectively 246 kilometers.
By car or train, the actual journey to Śródmieście is certainly longer, as only the direct route (as the crow flies) between Janowiec Wielkopolski and Śródmieście has been calculated here.
Air line (approximately)
246 kilometers
133 nautical miles