Réponse:
1
a) 48 secondes
b) 75 Mo
2
a) 8min 30 secondes
b)480 pages
Explications étape par étape:
1
a) 5mo = 4sec
x12
60mo = 48sec
b) 5mo = 4sec
x15
75mo = 60sec=1min
2
a). 16pg = 2min
:8
2pg = 1/4min (15sec)
x34
68pg = 8,5min ( 8min 30sec)
b) 16pg = 2min
x12
480pg = 60min (1 heure)
