The calculated distance (air line) between Tarn Tāran and Khem Karan is approximately 30 miles respectively 49 kilometers.
By car or train, the actual journey to Khem Karan is certainly longer, as only the direct route (as the crow flies) between Tarn Tāran and Khem Karan has been calculated here.
Air line (approximately)
49 kilometers
26 nautical miles