What is the speed of a wave, if the wavelength is 100 m and the period is 20 s?

a.) 2000 m/s

b.) 120 m/s

c.) 80 m/s

d.) 5 m/s

if you could include how you solved the problem, that would be amazing!

D. 5 m/s
This is because the formula to find the speed of a wave is the wavelength divided by the period (wavelength/period). Since the wavelength is 100 m and the period is 20 s, the speed is 5 m/s.
If you are confused on the units, then think about it this way: If you put this problem in fraction form, it would be: 100 m/20 s. 100 divided by 20 is 5, but m and s are still there. Remember that this "/" is also a division symbol. Therefore, the unit will be m/s