Sagot :
21h*7=147h
47min*7=329min
329=60*5+29
329min=5h29min
147+5=152
21h47min x 7=152h 29min
convertie en seconde puis multiplie et reconvertie en Jour hh:mm:ss
21h = 21x3600 = 75600s
47min = 47x60 = 2820s
donc au total :
78420s
78420 x 7 = 548940s
1J = 24h = 86400s
nbr de jours ? :
548940/86400 donne déjà 6J + hh:min:ss
6x86400 = 518400s
548940-518400=30540s
nbr d'heures ? :
30540/3600 donne 8h + min:ss
8x3600 = 1740s
nbr de minutes ? :
1740/60 donne 29min
donc c'est :
21h47min x 7 = 6J 8h29min