A and B process 700 parts each; A starts 1.5 hours later than B, and finishes 0.5 hours earlier than B. It is known that the working efficiency ratio of A and B is 7:5, how many parts does A process per hour.
甲乙两人各加工700个零件；甲比乙晚1.5小时开工，结果比乙还提前0.5小时完成．已知甲乙的工作效率比是7：5，甲每小时加工零件是多少个．
<gadget id="calculator">1.5 + 0.5</gadget>
<output>2</output>

<gadget id="calculator">7 - 5</gadget>
<output>2</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">2 / (2/5)</gadget>
<output>5</output>

<gadget id="calculator">700 / 5</gadget>
<output>140</output>

<result>140</result>