Question 1152826
Note that 3/4 hr = {{{ (3/4)*60 = 45 }}} min
18:45 minus 2:45 = 16:00
and
16:00 minus :40 min = 15:20
15:20 is the latest she should leave
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16:00 is NOT 24 hour time.
It's 1600.
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15:20 is NOT 24 hour time.
It's 1520
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Don't get involved with things you don't know about.