What would be the solution for this

The sound source of a ship's sonar system operates at a frequency of 22 kHz. The speed of sound in water (assumed to be at a uniform temperature of 20C) is 1482 m/s. a) Calculate the length of the waves emitted by the source. b) Calculate the frequency difference between the directly radiated and reflected waves from a whale traveling directly toward the ship at 4.95 m/s The ship is at rest in the water.

Two submarines are on a frontal collision course during maneuvers in the North Atlantic. The first submarine is moving at 20.2 km/h and the second at 94.6 km/h. The first sends a sonar signal (sound wave in water) of 1030 Hz. Sonar waves travel at 5470 km/h. a) The second submarine pick up the signal. What frequency does the sonar detector on this second submarine hear? b) The first submarine picks up the reflected signal. What frequency does the sonar detector hear from this primer? submarine? (Assuming the ocean is calm)