A string that is fixed at both ends has a length of 2.50 m. When the string

Question:

A string that is fixed at both ends has a length of 2.50 m. When the string vibrates at a frequency of 85.0 Hz, a standing wave with five loops is formed.
(a) What is the wavelength of the waves that travel on the string?
(b) What is the speed of the waves?
(c) What is the fundamental frequency of the string?