Răspuns :
1 grad=60 min
81 min=1 grad si 21 min
129 grade si 81 min=130 grade si 21 min
180 grade = 179 grade si 60 min
efectuam scaderea
179 grade si 60 min-130 grade si 21 min= 49 grade si 39 min
81 min=1 grad si 21 min
129 grade si 81 min=130 grade si 21 min
180 grade = 179 grade si 60 min
efectuam scaderea
179 grade si 60 min-130 grade si 21 min= 49 grade si 39 min