Answer:
\[\frac{{{({{\upsilon }_{rms}})}_{Kr}}}{{{({{\upsilon }_{rms}})}_{{{H}_{2}}}}}=\sqrt{\frac{{{M}_{{{H}_{2}}}}}{{{M}_{Kr}}}}=\sqrt{\frac{1}{225}}=\frac{10}{15}=\mathbf{2:3}\]
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