Two trains departed from two stations 1260 kilometers apart at the same time and went towards each other. After 4.5 hours, the two trains met. The slow train travels 120 kilometers per hour, how many kilometers per hour does the express train travel?
两列火车从相距1260千米的两站同时开出相向而行，4.5小时后两车相遇．慢车每小时行120千米，快车每小时行多少千米？
<gadget id="calculator">1_260 / 4.5</gadget>
<output>280</output>

<gadget id="calculator">280 - 120</gadget>
<output>160</output>

<result>160</result>