Cars A and B drive from two places 600 kilometers apart at the same time, and they travel the entire distance in 4 hours (4/5). Car B travels 50 kilometers per hour, how many kilometers per hour does Car A travel?
甲乙两车从相距600千米的两地同时相对开出，4小时两车共行了全程的(4/5)．乙车每小时行50千米，甲车每小时行多少千米？
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">(4/5) / 4</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">600 * (1/5)</gadget>
<output>120</output>

<gadget id="calculator">120 - 50</gadget>
<output>70</output>

<result>70</result>