During the winter vacation, Xiao Ming went to play at his grandmother's house. When he left home, Xiao Ming looked at the clock. After returning from his grandmother's house, he looked at the clock again. It was exactly 12 o'clock at this time, and Xiao Ming happened to be away from home for 40 hours. Xiao Ming What time is it on the clock face from home to grandma's house?
寒假时，小明去外婆家玩儿，从家出发时，小明看了一下钟，从外婆家回来后，又看了一下钟，此时恰好是12时整，而且小明恰好离家40小时，小明从家出发去外婆家时钟面是几时？
<gadget id="calculator">40 - 24</gadget>
<output>16</output>

<gadget id="calculator">24 - 16</gadget>
<output>8</output>

<result>8</result>