The calculated distance (air line) between Pervomaisc and Rîbniţa is approximately 84 miles respectively 136 kilometers.
By car or train, the actual journey to Rîbniţa is certainly longer, as only the direct route (as the crow flies) between Pervomaisc and Rîbniţa has been calculated here.
Air line (approximately)
136 kilometers
73 nautical miles