The calculated distance (air line) between Zürich (Kreis 7) / Hirslanden and Basel is approximately 48 miles respectively 78 kilometers.
By car or train, the actual journey to Basel is certainly longer, as only the direct route (as the crow flies) between Zürich (Kreis 7) / Hirslanden and Basel has been calculated here.
Air line (approximately)
78 kilometers
42 nautical miles