The calculated distance (air line) between Ar Rām wa Ḑāḩiyat al Barīd and Gaza is approximately 51 miles respectively 82 kilometers.
By car or train, the actual journey to Gaza is certainly longer, as only the direct route (as the crow flies) between Ar Rām wa Ḑāḩiyat al Barīd and Gaza has been calculated here.
Air line (approximately)
82 kilometers
44 nautical miles