The enemy car is running away 45 kilometers in front of our car at a speed of 60 kilometers per hour. My car is chasing closely at a speed of 80 kilometers per hour. How many hours will it take to catch up?
敌车在我车前方45千米的地方逃跑，速度为每小时60千米，我车紧紧追，速度为每小时80千米，需几个小时可以追上？
<gadget id="calculator">80 - 60</gadget>
<output>20</output>

<gadget id="calculator">45 / 20</gadget>
<output>9/4 = around 2.25</output>

<result>9/4 = around 2.25</result>