High-speed trains run an average of 341 kilometers per hour, which is 19 kilometers less than three times the average hourly rate of ordinary trains. How many kilometers per hour are ordinary trains on average? (solution by equation)
高速列车平均每小时行341千米，比普通列车平均每小时的3倍少19千米，普通列车平均每小时行多少千米？(用方程解)
<gadget id="calculator">341 + 19</gadget>
<output>360</output>

<gadget id="calculator">360 / 3</gadget>
<output>120</output>

<result>120</result>