A sound source A and a reflecting surface B move directly toward each other. Relative to the air, the speed of source A is $28\mathrm{.}9$ m$/$s$,$ the speed of surface B is $63\mathrm{.}2$ m$/$s$,$ and the speed of sound is $330$ m$/$s$.$ The source emits waves at frequency $1380$ Hz as measured in the source frame. In the reflector frame, what are $($a$)$ the frequency and $($b$)$ the wavelength of the arriving sound waves? In the source frame, what are $($c$)$ the frequency and $($d$)$ the wavelength of the sound waves reflected back to the source?