After a car travels the whole distance (1/5) at a speed of 45 kilometers per hour, it is still 90 kilometers away from the midpoint. At this speed, how many hours will it take to complete the journey?
一辆汽车以每小时45千米的速度行了全程的(1/5)后，离中点还有90千米，照这样的速度，行完全程要多少小时？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(1/2) - (1/5)</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">90 / (3/10)</gadget>
<output>300</output>

<gadget id="calculator">300 / 45</gadget>
<output>20/3 = around 6.666667</output>

<result>20/3 = around 6.666667</result>