First you find the frequency which is. 1/T(period) so u get 110^10
Now that you know frequency u can solve for speed: s= wavelength frequency, but don't forget to convert 3cm into meters: 3/100= .03m so now you do (110^10)(.3)= 300,000,000 m/s or 310^8 m/s
Hope this helped :))
