Please read $($don$\text{'}$t use CGPT$)$:

Need help with this past paper problem; I$\text{'}$m not sure how to incorporate the velocity into the calculation for B$).$

The answer to A$)$ is straight forward, it is $36\mathrm{.}5$ degrees for wet bulb temp using psycometric chart $($I$\text{'}$ve done this already$).$

B$)$ the answer should be $1\mathrm{.}4$m as indicated on the answers $-$ can anyone please illustrate a clear solution for me$?$ Thank you.