The calculated distance (air line) between Bayt Ūmmar and Rafaḩ is approximately 56 miles respectively 89 kilometers.
By car or train, the actual journey to Rafaḩ is certainly longer, as only the direct route (as the crow flies) between Bayt Ūmmar and Rafaḩ has been calculated here.
Air line (approximately)
89 kilometers
48 nautical miles