We can do this by multiplying the speed in kilometers per hour by 1000 (to convert kilometers to meters) and then dividing by 3600 (to convert hours to seconds). This gives us:
\[90 \mathrm{~km/h} = 90 \times \frac{1000}{3600} \mathrm{~m/s} = 25 \mathrm{~m/s}\]
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