Two trains departed from Binhai Station at the same time, running in opposite directions. The average speed of the train bound for Fujiang Station is 160 km/h, and the average speed of the train bound for Shuangshan Station is 70 km/h. The distance from Fujiang to Shuangshan is about 3450 km. How many hours did the car drive each?
两列火车同时从滨海站出发，相背而行．开往富江站的火车平均速度为160千米/时，开往双山站的火车平均速度为70千米/时，从富江到双山大约有3450千米，结果两车同时到站，两车各行驶了几小时？
<gadget id="calculator">160 + 70</gadget>
<output>230</output>

<gadget id="calculator">3_450 / 230</gadget>
<output>15</output>

<result>15</result>