A geologist sends a sound signal through a layer of granite and then a layer of limestone. The frequency of the signal is 5.0 kHz5.0\ \mathrm{kHz}5.0 kHz in both layers.
A detector is positioned below the two layers.
| rock layer | distance travelled by the signal | wavelength of the signal |
|---|---|---|
| granite | 75 m | 1.00 m |
| limestone | 48 m | 0.80 m |
Calculate the total time taken for the signal to reach the detector.