Teacher Wang travels from Maoming to Guilin by car. When the train travels the whole way (4/7), Teacher Wang looks at the odometer. At this time, there are still 315 kilometers away from Guilin. He asked how many kilometers is the whole journey from Maoming to Guilin ?
王老师从茂名坐车到桂林旅游，当火车行了全程的(4/7)时，王老师看了下里程表，这时离桂林还有315千米，问茂名到桂林的全程是多少千米？
<gadget id="calculator">4 / 7</gadget>
<output>4/7 = around 0.571429</output>

<gadget id="calculator">1 - (4/7)</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">315 / (3/7)</gadget>
<output>735</output>

<result>735</result>