A train travels from A to B in 8 hours (4/7). At this speed, how many hours will it take to reach B?
一列火车从甲地开往乙地，8小时行了全程的(4/7)．照这样的速度，再行几小时可到达乙地？
<gadget id="calculator">4 / 7</gadget>
<output>4/7 = around 0.571429</output>

<gadget id="calculator">1 - (4/7)</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">(4/7) / 8</gadget>
<output>1/14 = around 0.071429</output>

<gadget id="calculator">(3/7) / (1/14)</gadget>
<output>6</output>

<result>6</result>