A factory produces a batch of cars, and completes the plan (3/5) in the first half of the year, and (4/7) in the second half of the year. In this way, the annual production exceeds 600 cars. How many cars are planned to be produced in the whole year?
某工厂生产一批汽车，上半年完成计划的(3/5)，下半年完成计划的(4/7)，这样全年超产600辆，全年计划生产多少辆汽车？
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">4 / 7</gadget>
<output>4/7 = around 0.571429</output>

<gadget id="calculator">(4/7) - 1</gadget>
<output>-3/7 = around -0.428571</output>

<gadget id="calculator">(3/5) + (-3/7)</gadget>
<output>6/35 = around 0.171429</output>

<gadget id="calculator">600 / (6/35)</gadget>
<output>3_500</output>

<result>3_500</result>