Would you please solve it real quick, that will be helpful and appreciated. Thank you. I will give you a good feedback too.

A tube, open on one end is filled with an unknown gas (pretend it doesn't leak out). The tube is 1.95 m in length and 0.03 m in diameter. By using different tuning forks, it is found that resonances can be heard at frequencies of 64 Hz, 132 Hz, and 200 Hz, and no frequencies in between these. What is the speed of the sound in the gas? 1.95 m 1 0.03 m