Grandmother's clocks

Grandmother's clock is late every hour by half a minute. Grandmother it by set exactly at 8.00 am. How many hours will show after 24 hours.?


x = 7:48 Wrong answer


x=8+24 (360030)/360024=395=7.8=7:48x=8+24 \cdot \ (3600-30)/3600-24=\dfrac{ 39 }{ 5}=7.8=7:48

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