The calculated distance (air line) between Bihār Sharīf and Khagaul is approximately 40 miles respectively 64 kilometers.
By car or train, the actual journey to Khagaul is certainly longer, as only the direct route (as the crow flies) between Bihār Sharīf and Khagaul has been calculated here.
Air line (approximately)
64 kilometers
34 nautical miles