The express train and the local train depart from A to B at the same time. The slow train travels 50 kilometers per hour. After 3.5 hours, the distance between the two vehicles is 56 kilometers. How many kilometers per hour does the express train travel?
快车和慢车同时从甲地出发开往乙地，慢车每小时行50千米，经过3.5小时两车相距56千米，快车每小时行多少千米？
<gadget id="calculator">50 * 3.5</gadget>
<output>175</output>

<gadget id="calculator">175 + 56</gadget>
<output>231</output>

<gadget id="calculator">231 / 3.5</gadget>
<output>66</output>

<result>66</result>