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