The calculated distance (air line) between Dor Mărunt and Ploieşti is approximately 56 miles respectively 90 kilometers.
By car or train, the actual journey to Ploieşti is certainly longer, as only the direct route (as the crow flies) between Dor Mărunt and Ploieşti has been calculated here.
Air line (approximately)
90 kilometers
49 nautical miles