Look in the details part for the question.?

Question

Two submarines are underwater and approaching each other head-on. Sub A has a speed of 16 m/s and sub B has a speed of 10 m/s. Sub A sends out a 1410 Hz sonar wave that travels at a speed of 1522 m/s. (a) What is the frequency of the sound detected by sub B?(b) Part of the sonar wave is reflected from B and returns to A. What frequency does A detect for this reflected wave?

Answer 1

Obviously it is a Doppler effect problem :->)