Răspuns :
1/2*x=x/2 prima zi
x-x/2=2x/2-x/2=x/2 km rămași
1/2*x/2=x/4 a doua zi
x/2-x/4=50
2x/4-x/4=50
x/4=50
x=200 km
prima zi : 1/2*200=100 km
a doua zi : 1/2*100=50 km
x-x/2=2x/2-x/2=x/2 km rămași
1/2*x/2=x/4 a doua zi
x/2-x/4=50
2x/4-x/4=50
x/4=50
x=200 km
prima zi : 1/2*200=100 km
a doua zi : 1/2*100=50 km