Two cars

Car A1 goes at average speed of 106 km/h and the second car A2 goes at 103 km/h. How many second will it take car A1 to circulate car A2? Assume that both cars are 5 meters long and the safety gap between cars is 1.5 meters.

Correct result:

t =  15.6 s

Solution:

$$\begin{gathered} t=s\mathrm{/}v \\ s=2(5+1.5)=13m \\ v=(v_1-v_2)\mathrm{/}3.6=(106-103)\mathrm{/}3.6=0.833m\mathrm{/}s \\ t=13\mathrm{/}0.833=15.6\text{ s} \end{gathered}$$

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