The calculated distance (air line) between Thenzawl and Kailāshahar is approximately 85 miles respectively 136 kilometers.
By car or train, the actual journey to Kailāshahar is certainly longer, as only the direct route (as the crow flies) between Thenzawl and Kailāshahar has been calculated here.
Air line (approximately)
136 kilometers
73 nautical miles