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1) 2h 35 min 30 s + 1 h 45 min 40 s =3 h 80 min 70 s = 3 h 81 min 10 s = 4 h 21 min 10 s
2) 4 h 13 min 23 s-2 h 28 min 35 s=3 h 73 min 23 s-2 h 28 min 35 s =
= 3 h 72 min 83 - 2 h 28 min 35 s=1 h 44 min 48 s​