The calculated distance (air line) between Smach Mean Chey and Kampong Speu is approximately 101 miles respectively 162 kilometers.
By car or train, the actual journey to Kampong Speu is certainly longer, as only the direct route (as the crow flies) between Smach Mean Chey and Kampong Speu has been calculated here.
Air line (approximately)
162 kilometers
88 nautical miles