(A) The distance between Shenzhen and Changsha is about 800 kilometers. An express train travels from Shenzhen to Changsha at a speed of 100 kilometers per hour, and a slow train travels from Changsha to Shenzhen at a speed of 60 kilometers per hour. Two trains leave at the same time, and after how many hours the two trains meet? How far is the train from Changsha when it meets?
(A)深圳和长沙相距约800千米，一列快车从深圳开往长沙速度是100千米/时，一列慢车从长沙开往深圳速度是60千米/时．两列火车同时开出，经过几小时两车相遇？相遇时列车距离长沙有多远？
<gadget id="calculator">100 + 60</gadget>
<output>160</output>

<gadget id="calculator">800 / 160</gadget>
<output>5</output>

<gadget id="calculator">60 * 5</gadget>
<output>300</output>

<result>300</result>