The hour and minute hands of Grandpa's old-fashioned clock overlap once every 66 minutes. How many minutes does this clock slow every day and night?
爷爷的老式时钟的时针与分针，每隔66分钟两针重合一次，这只时钟每昼夜慢多少分钟？
<gadget id="calculator">1_440 / 121</gadget>
<output>1_440/121 = around 11.900826</output>

<result>1_440/121 = around 11.900826</result>