A dipper makes 15 complete oscillations in 5.0 s. The distance across four complete wavelengths is 48 cm. What is the wave speed?
0.04 m/s0.04\ \mathrm{m/s}0.04 m/s
0.36 m/s0.36\ \mathrm{m/s}0.36 m/s
3.60 m/s3.60\ \mathrm{m/s}3.60 m/s
1.44 m/s1.44\ \mathrm{m/s}1.44 m/s