The calculated distance (air line) between Torbat-e Jām and Serhetabat is approximately 97 miles respectively 156 kilometers.
By car or train, the actual journey to Serhetabat is certainly longer, as only the direct route (as the crow flies) between Torbat-e Jām and Serhetabat has been calculated here.
Air line (approximately)
156 kilometers
84 nautical miles