Simplify the ratio first, then calculate the ratio. (1/4) hour: 35 minutes.
先化简比，再求比值．(1/4)小时：35分．
<gadget id="calculator">15 / 5</gadget>
<output>3</output>

<gadget id="calculator">35 / 5</gadget>
<output>7</output>

<gadget id="calculator">3 / 7</gadget>
<output>3/7 = around 0.428571</output>

<result>3/7 = around 0.428571</result>