в секундах:м\ (25 мин + 480 с/ 60)- 300 с
(25мин+480с/60)-300с=1208
480с/60=8
1500+8=1508
1508-300=1208
25мин=1500с
480/60=8 с
25=1500 с
1500+8=1508 с
1508-300=1208 с
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(25мин+480с/60)-300с=1208
480с/60=8
1500+8=1508
1508-300=1208
25мин=1500с
480/60=8 с
25=1500 с
1500+8=1508 с
1508-300=1208 с