The speed of a sound wave in seawater is
approximately 1500 m/s.
if this wave is transmitted at 10 ms−1, what
is its wavelength?
answer in units of cm

I think some of the given is wrong, 10 ms-1,  think it is only 10 s-1 which represents the frequency of the wave, and can be use to solve for the wavelength of the sound wave given
 wavelength = wave speed / frequency
wavelength = 1500 m/s / 10 s-1
wavelength = 150 m ( 100 cm / 1 m ) = 15000 cm

Biased means unfair but that's all ik