The calculated distance (air line) between Patna and Bihār Sharīf is approximately 36 miles respectively 59 kilometers.
By car or train, the actual journey to Bihār Sharīf is certainly longer, as only the direct route (as the crow flies) between Patna and Bihār Sharīf has been calculated here.
Air line (approximately)
59 kilometers
32 nautical miles