A passenger car travels 280 kilometers from place A to place B in 4 hours, and it is still 490 kilometers away from place B. According to this calculation, how many hours does it take for this bus to travel from A to B?
一辆客车从甲地开往乙地，4小时行驶280千米，离乙地还有490千米．照这样计算，这辆客车从甲地到乙地共需几小时？
<gadget id="calculator">280 + 490</gadget>
<output>770</output>

<gadget id="calculator">280 / 4</gadget>
<output>70</output>

<gadget id="calculator">770 / 70</gadget>
<output>11</output>

<result>11</result>