The calculated distance (air line) between Ar Rām wa Ḑāḩiyat al Barīd and Az Zuwāydah is approximately 58 miles respectively 93 kilometers.
By car or train, the actual journey to Az Zuwāydah is certainly longer, as only the direct route (as the crow flies) between Ar Rām wa Ḑāḩiyat al Barīd and Az Zuwāydah has been calculated here.
Air line (approximately)
93 kilometers
50 nautical miles