A train travels $400 \text{ km}$ at a uniform speed. If the speed had been $10 \text{ km/h}$ more, it would have taken $2$ hours less for the same journey, then the speed of the train is _____.
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In speed-time problems:
\[
\text{Time} = \frac{\text{Distance}}{\text{Speed}}
\]
If speed increases, time decreases. Always use this relationship carefully while forming equations.