The road from Luxi to Maitreya is 42 kilometers long. A car drove from Luxi to Maitreya, and traveled (5/7), how many kilometers away from Luxi?
从泸西到弥勒的公路长42千米．一辆汽车从泸西开往弥勒，行驶了(5/7)，离泸西还有多少千米？
<gadget id="calculator">5 / 7</gadget>
<output>5/7 = around 0.714286</output>

<gadget id="calculator">42 * (5/7)</gadget>
<output>30</output>

<result>30</result>