A person drives a car and travels 168 kilometers in 2 hours. At this speed, he drives for 9 hours. How many kilometers can he travel in total?
某人开汽车，2小时行168千米，照这样的速度，他行驶了9个小时，一共可以行多少千米？
<gadget id="calculator">168 / 2</gadget>
<output>84</output>

<gadget id="calculator">84 * 9</gadget>
<output>756</output>

<result>756</result>