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A waiter with a tray of drinks is about to cross a street one-way 3 meter wide. A truck has lost a row of steel coils and head rolling down the street, at the time when the waiter was preparing to cross the street the first coil is 15 meters. The waiter has decided to cross the street and knows that the slower less soft drink do you fall. What is the length of the route that will allow cross street at the slowest speed possible without you take the coil?