Cars 6

At 9:00 am two cars started from the same town and traveled at a rate of 35 miles per hour and the other car traveled at a rate of 40 miles per hour. After how many hours will the cars be 30 miles apart?

Correct result:

t =  6 h

Solution:

$$\begin{gathered} v_1=35\text{ mph } \\ {v}_2=40\text{ mph } \\ v=v_2-v_1=40-35=5\text{ mph } \\ s=30\text{ m } \\ t=s\mathrm{/}v=30\mathrm{/}5=6\text{ h} \end{gathered}$$

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