The distance between A and B is 280 kilometers. A car and a tractor drive from the two places at the same time. After 4 hours, the two cars meet. The speed of the car is 4 times that of the tractor. How many kilometers does the car travel per hour?
甲乙两地相距280千米，一辆汽车和一辆拖拉机同时分别从两地相对开出，经过4小时两车相遇，汽车的速度是拖拉机的4倍．汽车每小时行多少千米？
<gadget id="calculator">280 / 4</gadget>
<output>70</output>

<gadget id="calculator">1 + 4</gadget>
<output>5</output>

<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">70 * (4/5)</gadget>
<output>56</output>

<result>56</result>