The calculated distance (air line) between Shemgang and Samdrup Jongkhar is approximately 60 miles respectively 96 kilometers.
By car or train, the actual journey to Samdrup Jongkhar is certainly longer, as only the direct route (as the crow flies) between Shemgang and Samdrup Jongkhar has been calculated here.
Air line (approximately)
96 kilometers
52 nautical miles