Grandpa's old-fashioned clock is not accurate at all. Its hour and minute hands coincide every 61+4/11 minutes. How many minutes is the clock fast or slow each day?
爷爷的老式钟一点也不准，它的时针与分针每隔61+4/11分钟重合一次．问这只时钟每天快或慢多少分钟？
<gadget id="calculator">24 * 60</gadget>
<output>1_440</output>

<gadget id="calculator">4 / 11</gadget>
<output>4/11 = around 0.363636</output>

<gadget id="calculator">61 + (4/11)</gadget>
<output>675/11 = around 61.363636</output>

<gadget id="calculator">720 / 11</gadget>
<output>720/11 = around 65.454545</output>

<gadget id="calculator">60 / (720/11)</gadget>
<output>11/12 = around 0.916667</output>

<gadget id="calculator">(675/11) * 24 * (11/12)</gadget>
<output>1_350</output>

<gadget id="calculator">1_440 - 1_350</gadget>
<output>90</output>

<result>90</result>