It's a holiday, and my mother takes Xiaoyu to my grandmother's house. I have to take a 4-hour train first, and then take a 2-hour car to my grandmother's house. The speed of the train is 140 km/h, and the car travels an average of 80 km/h. How many kilometers does it take for Xiaoyu to reach grandma's house?
放假了，妈妈带小雨去外婆家，先要乘4小时的火车，再乘2小时的汽车就到了外婆家．火车的速度是140千米/时，汽车平均每小时行80千米，小雨到外婆家一共有多少千米？
<gadget id="calculator">140 * 4</gadget>
<output>560</output>

<gadget id="calculator">80 * 2</gadget>
<output>160</output>

<gadget id="calculator">560 + 160</gadget>
<output>720</output>

<result>720</result>