That depends, what wave you are talking about. The general relationship is: speed (of the wave) = frequency x wavelength. Solving for frequency:
frequency = speed / wavelength
If you are talking about an electromagnetic wave in a vacuum, the speed is about 300,000,000 meters/second. Other waves, however, can have quite different speeds.
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Simply using the relation wavelength = velocity / frequency So required wavelength = 25/5 = 5 m
(frequency) = (speed) / (wavelength) = (15 m per sec) / (3 m) = 5 per sec = 5 Hz.
10 m
For any wave, the speed of the wave is the product of its frequency and of its wavelength.
Wave-Speed = (wavelength) x (frequency) = (5.0 m) x (7.5 per second) = 37.5 m/sec