Răspuns:
1 h 47 min
2 h 25 min
6 h 49 min
Explicație pas cu pas:
11 h 35 min - 9 h 48 min = 10 h (60 + 35) min - 9 h 48 min =
= 10 h 95 min - 9 h 48 min = 1 h 47 min
13 h 20 min - 10 h 55 min = 12 h (60 + 20) min - 10 h 55 min =
12 h 80 min - 10 h 55 min = 2 h 25 min
21 h 43 min - 14 h 54 min = 20 h (60 + 43) min - 14 h 54 min =
20 h 103 min - 14 h 54 min = 6 h 49 min
