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Calculati:

a) 3h 25 min+1h 15 min;
b) 2h 40min-1h 20min;
c) 12 h 30 min+5 h 25 min + 3h 40 min;
d) 25 min 30s- 10 min 40s;
e) 1h 25min 15s+2h 15 min 45s;
f) 3h 10 min 20s- 1h 25 min 30s.