The distance between A and B is 880 kilometers. A car starts from A. After 2 o'clock, a bus starts from B and runs towards each other. After 4 o'clock, the two cars meet. It is known that a car travels 20 kilometers per hour more than a bus. Ask: How many kilometers per hour does a bus travel?
甲、乙两地相距880千米，小轿车从甲地出发，2时后，大客车从乙地出发相向而行，又经过4时两车相遇．已知小轿车比大客车每时多行20千米，问：大客车每时行多少千米？
<gadget id="calculator">20 * 2</gadget>
<output>40</output>

<gadget id="calculator">20 * 4</gadget>
<output>80</output>

<gadget id="calculator">880 - 40 - 80</gadget>
<output>760</output>

<gadget id="calculator">2 + 4 + 4</gadget>
<output>10</output>

<gadget id="calculator">760 / 10</gadget>
<output>76</output>

<result>76</result>