LatArtFer 3) (31-14 7/15) - (27 2/3 - 19 3/4)=
(31*15-(14*15+7))/15 - (((27*3+2)*4-((19*4+3)*3)/12 =
(465 - 217)/15 - (332 -
237)/12 =
248/15 - 95/12 =
(248*4-95*5)/60=
517/60 =
8 37/60

4) (43 7/18 - 5 2/9) - 12 8/27 =
((43*28+7) - (5*9+2)*2))/18 - (12*27+8)/27=
(1211-94)/18 - 322/27=
1117/18 - 322/27=
(1117*3 - 32*2)/54=
3287/54=
60 47/54

задача:

1) 14 5/27 + 5 1/9 = (383 + 46*3)/27 = 521/27
2) 14 5/27 - 3 5/12= 383/27 - 41/12= (383 *4 - 41*9 )/108 = 1163/108
3) 383/27 + 521/27 + 1163/108 = (904*4 + 1163)/108 = 4479 / 108 = 44.25 км
Ответ 44.25