The distance between A and B is 450 kilometers. A car starts from A and travels 80 kilometers per hour. It has been driving for 3 hours. How many kilometers will it take to reach B?
甲，乙两地相距450千米，一辆汽车从甲地出发，每小时行80千米，已经行了3小时，还要行多少千米才能到达乙地？
<gadget id="calculator">80 * 3</gadget>
<output>240</output>

<gadget id="calculator">450 - 240</gadget>
<output>210</output>

<result>210</result>