The calculated distance (air line) between Ciputat and Rengasdengklok is approximately 42 miles respectively 67 kilometers.
By car or train, the actual journey to Rengasdengklok is certainly longer, as only the direct route (as the crow flies) between Ciputat and Rengasdengklok has been calculated here.
Air line (approximately)
67 kilometers
36 nautical miles