Cars A and B drive from opposite places at the same time, and travel the entire distance (2/3) in 5 hours. The speed ratio of cars A and B is 5:3. Car B will finish the rest of the journey alone. How many hours are left?
甲乙两车同时分别从两地相对开出，5小时正好行了全程的(2/3)，甲乙车的速度比是5：3．余下的路程由乙车单独走完，还有多少小时？
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">1 - (2/3)</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(2/3) / 5</gadget>
<output>2/15 = around 0.133333</output>

<gadget id="calculator">5 + 3</gadget>
<output>8</output>

<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">(2/15) * (3/8)</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">(1/3) / (1/20)</gadget>
<output>20/3 = around 6.666667</output>

<result>20/3 = around 6.666667</result>