Cars A and B drive oppositely from two places 280 kilometers apart at the same time, and meet each other in (7/4) hours. Car B travels 70 kilometers per hour, how many kilometers per hour does Car A travel?
甲乙两车从相距280千米的两地同时相对开出，(7/4)小时相遇．乙车每小时行70千米，甲车每小时行多少千米？
<gadget id="calculator">7 / 4</gadget>
<output>7/4 = around 1.75</output>

<gadget id="calculator">280 / (7/4)</gadget>
<output>160</output>

<gadget id="calculator">160 - 70</gadget>
<output>90</output>

<result>90</result>