The calculated distance (air line) between Langnau and Zürich (Kreis 10) is approximately 47 miles respectively 75 kilometers.
By car or train, the actual journey to Zürich (Kreis 10) is certainly longer, as only the direct route (as the crow flies) between Langnau and Zürich (Kreis 10) has been calculated here.
Air line (approximately)
75 kilometers
40 nautical miles