Question
Xavier's boxing class usually lasts 1 h 30 min. However, last Monday, Xavier's class lasted 21 min longer than usual. The class started 9 min late. As such, Xavier's class ended at 8.43 p.m. instead of the usual time. What time does Xavier's boxing class usually start? (Leave your answer in 24-hour clock format.)
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Xavier's boxing class usually lasts 1 h 30 min. However, last Monday, Xavier's class lasted 21 min longer than usual. The class started 9 min late. As such, Xavier's class ended at 8.43 p.m. instead of the usual time. What time does Xavier's boxing class usually start? (Leave your answer in 24-hour clock format.)