A truck and a passenger car departed from Dongguan to Inner Mongolia at the same time. After 15 hours, the truck was 375 kilometers behind the passenger car. The truck travels 65 kilometers per hour, how many kilometers per hour does the passenger car travel? (solution by equation)
一列货车和一列客车同时从东莞出发开往内蒙古，经过15小时后货车落后客车375千米．货车每小时行65千米，客车每小时行多少千米？(用方程解)
<gadget id="calculator">65 * 15</gadget>
<output>975</output>

<gadget id="calculator">975 + 375</gadget>
<output>1_350</output>

<gadget id="calculator">1_350 / 15</gadget>
<output>90</output>

<result>90</result>