Zhang Qin drove 310 kilometers from A to B in 5 hours. At this speed, Zhang Qin can reach B in 12 hours. How many miles is it from A to B?
张钦乘车从甲地到乙地5小时行驶了310千米，照这样的速度，张钦12小时可以到达乙地．甲地到乙地有多少千米？
<gadget id="calculator">310 / 5</gadget>
<output>62</output>

<gadget id="calculator">62 * 12</gadget>
<output>744</output>

<result>744</result>