Question
Charlie's swimming class usually lasts 1 h 50 min. However, last Tuesday, Charlie's class lasted 11 min longer than usual. The class started 11 min late. As such, Charlie's class ended at 4.30 p.m. instead of the usual time. What time does Charlie's swimming class usually start? (Leave your answer in 24-hour clock format.)
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Charlie's swimming class usually lasts 1 h 50 min. However, last Tuesday, Charlie's class lasted 11 min longer than usual. The class started 11 min late. As such, Charlie's class ended at 4.30 p.m. instead of the usual time. What time does Charlie's swimming class usually start? (Leave your answer in 24-hour clock format.)