please show working out as i want to compare to my work thank you

Problem 2 (13 Marks] A certain pipe has resonant frequencies of 234 Hz, 390 Hz and 546 Hz, with no other resonant frequencies between these values. A. Is this a pipe open at both ends or closed at one end? [6 marks) B. What is the fundamental frequency ofthis pipe? (6 marks} C. How long is this pipe? (6 marks}