a) 1 ora = 60 min
1 min............ 8 l apa
60 min........... x
x = 60 * 8
x = 480 l
b) 2 h 15 min = 2 * 60 + 15 = 135 min
x = 135 * 8 = 1080 l
d) 3 h 30 min = 3 * 60 + 30 = 180 + 30 = 210 min
x = 210 * 8
x = 1680 l
e) 300 sec : 60 = 5 min
x = 5 * 8
x = 40 l