Answer:
So you have to do this Time Wise. What I mean by this is Kelly ended at 1:30 and she took 3 hours and 30 minutes with this being said, you subtract.
(Subtract 30 from the 3 hours and 30 minutes to make the 1:30 easier to solve)
1:30 - 30 = 1:00
So know we subtract 3 hours Time Wise.
(Go hour by hour of the 3 hours you have left. You subtract 3 times because there are 3 hours )
1:00 - 1:00 = 12:00
12:00 - 1:00 = 11:00
11:00 - 1:00 = 10:00
She started at 10:00.
