Discussion
Umar reached the place of meeting 30 minutes before time. Arvind reached 45 minutes late for the meeting. The meeting finished at 11:00 a.m., 30 minutes after Arvind reached the meeting. At what time did Umar arrive for the meeting?
Answer: B
Umar arrived at 9:15 a.m.
Work backwards. The meeting finished at 11:00 a.m., 30 minutes after Arvind arrived, so Arvind arrived at 10:30 a.m. He was 45 minutes late, so the meeting was scheduled to start at 9:45 a.m. Umar came 30 minutes before that time: 9:15 a.m.
9:45 a.m. is the scheduled start, not Umar's arrival. 9:00 a.m. and 9:30 a.m. result from adding or subtracting one of the intervals in the wrong direction.
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