The calculated distance (air line) between Gerāsh and Shahr-e Bābak is approximately 179 miles respectively 288 kilometers.
By car or train, the actual journey to Shahr-e Bābak is certainly longer, as only the direct route (as the crow flies) between Gerāsh and Shahr-e Bābak has been calculated here.
Air line (approximately)
288 kilometers
156 nautical miles