Răspuns:
Prima ora:
4/15× 180 = simplificat prin 15) = 4×12= 48 km
II.
5/8× 48 km = simplificat prin 8 = 5× 6= 30 km
III
( 48+30) ÷2= 78÷ 2= 39 km
IV
180 -( 48+30+38)=
180 - 117=
63 km
