A geophysics team prints a scale map of wavefronts produced by a controlled vibration. On the map, 1.0 cm represents 400 m. The wave speed in the ground is 3.0 × 103 m/s and the frequency is 5.0 Hz. What distance on the map represents four complete wavelengths?
6.0 cm6.0\ \mathrm{cm}6.0 cm
150 cm150\ \mathrm{cm}150 cm
600 cm600\ \mathrm{cm}600 cm
1.5 cm1.5\ \mathrm{cm}1.5 cm