The calculated distance (air line) between Taffūḩ and Khān Yūnis is approximately 46 miles respectively 74 kilometers.
By car or train, the actual journey to Khān Yūnis is certainly longer, as only the direct route (as the crow flies) between Taffūḩ and Khān Yūnis has been calculated here.
Air line (approximately)
74 kilometers
40 nautical miles