The calculated distance (air line) between Bihār Sharīf and Begusarai is approximately 41 miles respectively 66 kilometers.
By car or train, the actual journey to Begusarai is certainly longer, as only the direct route (as the crow flies) between Bihār Sharīf and Begusarai has been calculated here.
Air line (approximately)
66 kilometers
36 nautical miles