8. The shortest path from Atown to Cetown runs through Betown. Two of the signposts that can be seen on this path are shown, but one of them is broken and a number missing.
What distance was written on the broken sign?
A $2 \mathrm{~km}$
B $3 \mathrm{~km}$
C $4 \mathrm{~km}$
D $5 \mathrm{~km}$
E $6 \mathrm{~km}$
SolUtion
A

The first signpost shows that Betown is $4 \mathrm{~km}$ from Atown. The second signpost is $6 \mathrm{~km}$ from Atown, so must be $2 \mathrm{~km}$ from Betown.