Uniform wire W1 with 1.0m in length and 1.0mm in diameter is connected to one end of another uniform wire W2 of the same material with 2.0m in length and 2.0mm in diameter. A voltage source is connected across the wires and a current is passed through them. If it takes an average time of s for a conduction electron to travel through wire W1, how long does it take for such an electron to travel through wire W2