The calculated distance (air line) between An Muileann gCearr and Newtown Trim is approximately 23 miles respectively 38 kilometers.
By car or train, the actual journey to Newtown Trim is certainly longer, as only the direct route (as the crow flies) between An Muileann gCearr and Newtown Trim has been calculated here.
Air line (approximately)
38 kilometers
20 nautical miles