An automobile increased its speed uniformly from 20 m/s to 30 m/s at rate 5 m/s2. During this time it traveled 50 meters. How long did it take the automobile to make this change?

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An automobile increased its speed uniformly from 20 m/s to 30 m/s at rate 5 m/s<sup>2</sup>. During this time it traveled 50 meters. How long did it take the automobile to make this change?