An aluminum wire of length 30.0 m is connected end-to-end with a copper wire of length of 20.0 m. Both have 1.00-mm diameters and are stretched to a tension of 140 N. Find how long (in seconds) it takes a transverse wave to travel the entire length of the two wires. The density of aluminum and copper are 2,710 kg/m³ and 8,920 kg/m³, respectively.
(A) 0.769
(B) 0.637
(C) 0.367
(D) 0.118
(E) 0.258