The calculated distance (air line) between Ribnica na Pohorju and Trbovlje is approximately 28 miles respectively 45 kilometers.
By car or train, the actual journey to Trbovlje is certainly longer, as only the direct route (as the crow flies) between Ribnica na Pohorju and Trbovlje has been calculated here.
Air line (approximately)
45 kilometers
25 nautical miles