Find the fundamental frequency and the frequency of the first three overtones of a pipe 45.0 cm

Question:

Find the fundamental frequency and the frequency of the first three overtones of a pipe 45.0 cm long
(a) If the pipe is open at both ends and
(b) If the pipe is closed at one end. Use v = 344 m/s.
(c) For each of these cases, what is the number of the highest harmonic that may be heard by a person who can hear frequencies from 20 Hz to 20,000 Hz?