Răspuns:
Explicație pas cu pas:
a)
8 min = 5 x 60 = 300 s
30 min = 30 x 60 = 1800 s
1/4 min = 60 : 4 = 15 s
3/2 min = 60 : 2 x 3 = 90 s
1 h = 3600 s
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b)
1/2 h = 60 : 2 = 30 min
1/3 h = 60 : 3 = 20 min
1/12 h = 60 : 12 = 5 min
2/5 h = 60 : 5 x 2 = 24 min
5/6 h = 60 : 6 x 5 = 50 min
3/20 h = 60 : 20 x 3 = 9 min
