Cars A and B drive from city A to city B at the same time. Car A travels 75 kilometers per hour, and car B travels 60 kilometers per hour. After 4 hours, car A arrives at city B. How far is car B from city B?
甲、乙两车同时从A城开往B城．甲车每小时行75千米，乙车每小时行60千米．4小时后甲车到达乙地，这时乙车离B城还有多远？
<gadget id="calculator">75 * 4</gadget>
<output>300</output>

<gadget id="calculator">60 * 4</gadget>
<output>240</output>

<gadget id="calculator">300 - 240</gadget>
<output>60</output>

<result>60</result>