The railway from Hohhot to Beijing is 660 kilometers long. Two trains depart from the two places at the same time and run towards each other. After 2 hours, the two trains meet. It is known that one train travels 150 kilometers per hour, how many kilometers per hour does the other train travel? (solution by equation)
呼和浩特到北京的铁路长660千米，两列火车从两地同时出发，相向而行，经过2小时两车相遇．已知一列火车每小时行150千米，另一列火车每小时行多少千米？(用方程解)
<gadget id="calculator">150 * 2</gadget>
<output>300</output>

<gadget id="calculator">660 - 300</gadget>
<output>360</output>

<gadget id="calculator">360 / 2</gadget>
<output>180</output>

<result>180</result>