Odczytujemy godziny i obliczamy, ile czasu minęło:

15 minut

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45 minut

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$2:55\stackrel{+5\text{min}}{\to }3:00\stackrel{+35\text{min}}{\to }3:35$  

40 minut

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$7:55\stackrel{+5\text{min}}{\to }8:00\stackrel{+30\text{min}}{\to }8:30$  

35 minut

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$3:45\stackrel{+15\text{min}}{\to }4:00\stackrel{+10\text{min}}{\to }4:10$  

25 minut

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$5:50\stackrel{+10\text{min}}{\to }6:00\stackrel{+25\text{min}}{\to }6:25$  

35 minut