A car delivers goods to a mountain. It travels on the mountain road at a speed of 45 kilometers per hour for 4 hours, and then at a speed of 55 kilometers per hour for 3 hours. How many kilometers has the car traveled in total?
一辆汽车向山区送货，以每小时45千米的速度在山路上行了4小时，又以时每小时行55千米的速度行了3小时，这辆车一共行了多少千米？
<gadget id="calculator">45 * 4</gadget>
<output>180</output>

<gadget id="calculator">55 * 3</gadget>
<output>165</output>

<gadget id="calculator">180 + 165</gadget>
<output>345</output>

<result>345</result>