The calculated distance (air line) between Banteay Meas Khang Kaeut and Kep is approximately 25 miles respectively 40 kilometers.
By car or train, the actual journey to Kep is certainly longer, as only the direct route (as the crow flies) between Banteay Meas Khang Kaeut and Kep has been calculated here.
Air line (approximately)
40 kilometers
22 nautical miles