Two eagles fly directly toward one another, the first at $13\mathrm{.}5$ m$/$s and the second at $21$ m$/$s$.$ Both screech, the first one emitting a frequency of $3250$ Hz and the second one emitting a frequency of $3650$ Hz$.$

$$ Part $($a$)$

What frequency of sound, in hertz, does the first eagle hear from the second if the speed of sound is $330$ m$/$s$?$

$$ Part $($b$)$

What frequency of sound, in hertz, does the second eagle hear from the first if the speed of sound is $330$ m$/$s$?$