A passenger car and a truck travel back to back from two places 60 kilometers apart, and the distance is 375 kilometers after 3.5 hours. It is known that the passenger car travels 52 kilometers per hour, how many kilometers per hour does the truck travel?
一辆客车与一辆货车从相距60千米的两地背向而行，3.5小时后相距375千米．已知客车每小时行52千米，货车每小时行多少千米？
<gadget id="calculator">375 - 60</gadget>
<output>315</output>

<gadget id="calculator">315 / 3.5</gadget>
<output>90</output>

<gadget id="calculator">90 - 52</gadget>
<output>38</output>

<result>38</result>