jeżeli 30% to 2:52 min to ile to bedzie 100%?

[latex]2h 52min = 2cdot60+52 = 120+52 = 172 min\\30\% --- 172 min\100\% --- x min\\x = 172cdotfrac{100\%}{30\%} = 172cdotfrac{10}{3} = frac{1720}{3} = 573min 20s =9h 33min 20s\\Odp. 100\% to 9h 33min 20s.[/latex]

2 godz.=120 min +52 min.=172 min.              172 min.-30%              x-100%                  172min.*100"30= 17200:30=  1720:3=573,33~~573min                    573 min.:60=9,55~~9,5 h