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.?

Result

x = 7:48 Wrong answer

Solution:

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

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