<PRE><B>Question 927109</B>
They are talking about 11 AM and 11PM on wednesday
and 3 PM the next friday
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11 AM WED to 11 AM THURS = 24 hrs
11 AM THURS to 11 AM FRI = 24 hrs
11 AM FRI to 3 PM FRI = 4 hrs
{{{ 24 + 24 + 4 = 52 }}} hrs
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If I start instead at 11 PM on WED, that will 
total 12 hrs less than the above, or
{{{ 52 - 12 = 40 }}} hrs
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They want to know the fraction:
{{{ 40/52 = 10/13 }}}
</PRE>