The calculated distance (air line) between Diepsloot and Ga-Rankuwa is approximately 22 miles respectively 35 kilometers.
By car or train, the actual journey to Ga-Rankuwa is certainly longer, as only the direct route (as the crow flies) between Diepsloot and Ga-Rankuwa has been calculated here.
Air line (approximately)
35 kilometers
19 nautical miles