Sagot :
1saat=60dk 60dk=3600sn 4saat=3600.4=14400 eder 15dk=60.15=900+ 14400=15300
4 saati ilk dk ya çevirelim
4sa.60=240dk
240dk.60=14.400
14.400 saniye iyi dersler en iyi seçermisin
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