If a car travels from Guangzhou to Beijing, if the speed is 120 km/h, it will take 20 hours; if the speed is 100 km/h, how many hours will it take?
小轿车从广州到北京，如果车速120千米/时，需要行驶20小时；如果车速为100千米/时，需要行驶多少小时？
<gadget id="calculator">120 * 20</gadget>
<output>2_400</output>

<gadget id="calculator">2_400 / 100</gadget>
<output>24</output>

<result>24</result>