The temperature at which speed increases by 10% is 354.53 kelvin
We know that ,
V = √(3RT/M)
Hence,
V ∝ √T
=> V₂/V₁ = √(T₂/T₁)
since the velocity increases by 10%, so,
V₂/V₁ = 1.1 and
T₁ = 293 k at NTP
Hence,
(T₂/T₁) = 1.1² = 1.21
=> T₂ = 1.21 x 293 = 354.53 kelvin