The calculated distance (air line) between Bakhchysarai and Yevpatoriya is approximately 39 miles respectively 63 kilometers.
By car or train, the actual journey to Yevpatoriya is certainly longer, as only the direct route (as the crow flies) between Bakhchysarai and Yevpatoriya has been calculated here.
Air line (approximately)
63 kilometers
34 nautical miles