The calculated distance (air line) between Maardu and Kohtla-Järve is approximately 81 miles respectively 130 kilometers.
By car or train, the actual journey to Kohtla-Järve is certainly longer, as only the direct route (as the crow flies) between Maardu and Kohtla-Järve has been calculated here.
Air line (approximately)
130 kilometers
70 nautical miles