car travels 450km from place A to place B in 5 hours, exactly (5/9) of the whole journey. At this speed, how many hours will it take to reach B? (Solution with proportional knowledge)
一辆汽车从甲地开往乙地，5小时行了450km，正好行驶了全程的(5/9)．照这样的速度，还需要几小时到达乙地？(用比例知识解)
<gadget id="calculator">5 / 9</gadget>
<output>5/9 = around 0.555556</output>

<gadget id="calculator">(5/9) * 5</gadget>
<output>25/9 = around 2.777778</output>

<gadget id="calculator">5 - (25/9)</gadget>
<output>20/9 = around 2.222222</output>

<gadget id="calculator">(20/9) / (5/9)</gadget>
<output>4</output>

<result>4</result>