Cars A and B drive from A and B for 4 hours to meet each other, A drives for another 3 hours to reach B, and B drives 60 kilometers in an hour. How many kilometers is the distance between A and B?
甲乙两车从A，B两地开出4小时遇，甲又开3小时到B地，乙小时行驶60千米，AB两地相距多少千米？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">3 + 4</gadget>
<output>7</output>

<gadget id="calculator">1 / 7</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">(1/4) - (1/7)</gadget>
<output>3/28 = around 0.107143</output>

<gadget id="calculator">60 / (3/28)</gadget>
<output>560</output>

<result>560</result>