A passenger car is driving from Kunming to Hekou, and a truck is driving from Hekou to Kunming at the same time. After 4 hours, the two cars meet, and after 3 hours, the bus is still 45 kilometers away from Hekou, and the truck is still 45 kilometers away from Kunming. 70 kilometers, how many kilometers is the distance from Kunming to Hekou?
一辆客车从昆明开往河口，同时一辆货车同时从河口开往昆明，4小时后两车相遇，相遇后又经过3小时，这时客车距河口还有45千米，货车距昆明还有70千米，昆明到河口相距多少千米？
<gadget id="calculator">45 + 70</gadget>
<output>115</output>

<gadget id="calculator">4 - 3</gadget>
<output>1</output>

<gadget id="calculator">115 / 1</gadget>
<output>115</output>

<gadget id="calculator">115 * 4</gadget>
<output>460</output>

<result>460</result>