The distance between two cities is 275 kilometers. A passenger car and a truck drive from the two cities at the same time. They meet after 2.5 hours. It is known that the speed of the truck is 50 km/h. What is the speed of the bus? (solution by equation)
两个城市相距275千米，一辆客车和一辆货车同时从这两城市相对开出，2.5小时后相遇，已知货车的速度是50千米/时，客车的速度是多少？(用方程解)
<gadget id="calculator">50 * 2.5</gadget>
<output>125</output>

<gadget id="calculator">275 - 125</gadget>
<output>150</output>

<gadget id="calculator">150 / 2.5</gadget>
<output>60</output>

<result>60</result>