drum are 10/10 părți.
10/10-3/10(prima zi )=7/10raman de parcurs
4/7×10/10=4/10 parcurge
450km=3/10
/---/---/---/---/--/---/---/--/---/---/
/---/---/---/ | (3/10)
....4/7=4/10 ( din rest ) ....[ 450 km ]
450:3=150 un segment
1 zi | 150×3 | = | 450 |
2 zi | 150×4 | = | 600 |
3 zi | 150×3 | = | 450 |
(450+450)+600=900+600=1500