72 grade 15 min 27 sec
14 grade 26 min 43 sec
----------------------------------------
86 grade 41 min 70 sec 70 sec = 1min si 10 sec
+ 1 min -60 sec
-----------------------------------------
86 grade 42 min 10 sec
2) m(MON)= 36 grade
m(AOB) = 64 grade
m(AOM) =1/2 din m(AOB) = 72 : 2 = 36
m(BON=m(MON)-1/2 din m(AOB)=36-64/2=36-32=4 grade
m(AOC)=2 * m(BON)+m(AOB)= 2(4+64)=136 grade
m(AON)=m(AOB)+m(BON=64+4=68 grade