The calculated distance (air line) between Depok and Rengasdengklok is approximately 37 miles respectively 59 kilometers.
By car or train, the actual journey to Rengasdengklok is certainly longer, as only the direct route (as the crow flies) between Depok and Rengasdengklok has been calculated here.
Air line (approximately)
59 kilometers
32 nautical miles