Alex, Curtis and Michael go boating together on a calm day. They leave the marina dock and travel at a speed of 40 km/h due east for 2.5 hours. Then, they travel 27 west of south for 1.5 hours at a speed of 30 km/h. At that point, their boat breaks down and they call the mechanic at the marina dock to come and help them. To get to them in the shortest time, how far must the mechanic travel and in what direction