Mr. Wang drove from city A to city B for business. First drive on the expressway for 3 hours at a speed of 100 km/h, and then drive on a general provincial road for 2 hours at a speed of 70 km/h. How many kilometers did Mr. Wang drive from city A to city B?
王老师开车从A城到B城办事．先在高速公路上行驶3小时，时速为100千米/时，后来又在一般省级公路上行驶了2小时，时速为70千米/时．王老师从A城到B一共行驶了多少千米？
<gadget id="calculator">100 * 3</gadget>
<output>300</output>

<gadget id="calculator">70 * 2</gadget>
<output>140</output>

<gadget id="calculator">300 + 140</gadget>
<output>440</output>

<result>440</result>