Mohan and Rohan start walking from two different points. Mohan starts from point X and walks 40 m towards West and then takes a left turn and walks 40 m. There after, he takes a right turn and walks 35 m to reach point Z. Rohan starts from point Y and walks 54 m towards East and then he turns right and walks 40 m. After that, he takes a left turn and walks 42 m to reach point Z. Find the shortest distance between Point X and Point Y via Point Z.