Eladevi, Susan, and Mia are located at points E, S, and M on one side of the river. Noah and Liam are located at points N and L on the other side of the river. The sides of the river are parallel. The distance between Eladevi and Susan is 6 yards, the distance between Susan and Mia is 6 yards, and the distance between Eladevi and Mia is 5 yards. The distance between Noah and Liam is 15 yards. What is the width of the river?