The distance between A and B is 270 kilometers. A truck and a passenger car are traveling towards each other from A and B at the same time. It is known that the speed of the truck is 65 km/h and the speed of the passenger car is 70 km/h. After how many hours did the two cars meet?
A、B两地相距270千米，一辆货车和一辆客车分别从A、B两地同时相向而行．已知货车的速度是65千米/时，客车的速度是70千米/时．经过多少小时两车相遇？
<gadget id="calculator">65 + 70</gadget>
<output>135</output>

<gadget id="calculator">270 / 135</gadget>
<output>2</output>

<result>2</result>