The calculated distance (air line) between Minamirinkan and Higashimurayama is approximately 18 miles respectively 29 kilometers.
By car or train, the actual journey to Higashimurayama is certainly longer, as only the direct route (as the crow flies) between Minamirinkan and Higashimurayama has been calculated here.
Air line (approximately)
29 kilometers
16 nautical miles