The "Little Grass" literary agency went to Wuxi Taihu Lake to collect folk songs during the holidays. The car departed from the school and traveled the entire distance (3/4) in (6/7) hours. At this time, it was still 4 kilometers away from the Taihu Lake in Wuxi. At this speed, how many hours will it take to complete the journey?
"小草"文学社假期到无锡太湖边采风．汽车从学校出发，(6/7)小时行了全程的(3/4)，这时距离无锡太湖边还有4千米．照这样的速度，行完全程共用多少小时？
<gadget id="calculator">6 / 7</gadget>
<output>6/7 = around 0.857143</output>

<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">(6/7) / (3/4)</gadget>
<output>8/7 = around 1.142857</output>

<result>8/7 = around 1.142857</result>