A passenger car travels 90 kilometers per hour, which is 1/6 faster than a truck. What is the formula for finding how many kilometers a truck travels per hour?
客车每小时行90千米，比货车快(1/6)，求货车每小时行多少千米的算式是多少
<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">1 + (1/6)</gadget>
<output>7/6 = around 1.166667</output>

<gadget id="calculator">90 / (7/6)</gadget>
<output>540/7 = around 77.142857</output>

<result>540/7 = around 77.142857</result>