The calculated distance (air line) between Mayāng Imphāl and Kohīma is approximately 75 miles respectively 120 kilometers.
By car or train, the actual journey to Kohīma is certainly longer, as only the direct route (as the crow flies) between Mayāng Imphāl and Kohīma has been calculated here.
Air line (approximately)
120 kilometers
65 nautical miles