1F esercizi per sabato 6

Geometria:
3h 24 min 56 sec + 1h 54 min 18 sec =
12h 35 min 44 sec + 1h 33 min 32 sec =
3 h – 1 h 32 min =
2h 12 min 23 sec – 1 h 21 min 44 sec
14h 34 min 34 sec x 3 =