A car travels the whole journey (6/7) in 4 hours, how many hours will it take to complete the journey?
一辆汽车4小时行了全程的(6/7)，行完全程还要几小时？
<gadget id="calculator">6 / 7</gadget>
<output>6/7 = around 0.857143</output>

<gadget id="calculator">1 - (6/7)</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">(6/7) / 4</gadget>
<output>3/14 = around 0.214286</output>

<gadget id="calculator">(1/7) / (3/14)</gadget>
<output>2/3 = around 0.666667</output>

<result>2/3 = around 0.666667</result>