Grandmother's clocks

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

Result

x = 7:48

Step-by-step explanation:

$x=8+24\cdot (3600-30)\mathrm{/}3600-24={\displaystyle \frac{39}{5}}=7.8=7:48$

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