A person walks 22.4 kilometers in 4 hours. At this speed, if he walks for another 3 hours, how many kilometers can he walk in total? (Solve with ratio)
某人步行4小时走了22.4千米，照这样的速度，如果再走3小时，一共可以走多少千米？(用比例解)
<gadget id="calculator">22.4 / 4</gadget>
<output>5.6</output>

<gadget id="calculator">5.6 * 4</gadget>
<output>22.4</output>

<gadget id="calculator">5.6 * 3</gadget>
<output>16.8</output>

<gadget id="calculator">22.4 + 16.8</gadget>
<output>39.2</output>

<result>39.2</result>