Big Ben in London is the most accurate mechanical clock of its size. The \(300-\mathrm{kg}\) hour hand is \(2.7 \mathrm{~m}\) long, and the \(100-\mathrm{kg}\) minute hand is \(4.2 \mathrm{~m}\) long. Calculate the rotational kinetic energy of the two-hand system, treating each hand as if it were a thin rod.