Patel, Quoc and Ron live near each other along the same straight road. Patel lives 0.6km from Quoc. Ron lives 0.4km from Patel.
How far apart do Quoc and Ron live?
A) They must live 0.2km apart.
B) They must live 1.0km apart.
C) They could live 0.2km or 1.0km apart.
D) They could live 0.8km or 1.2km apart.
Please explain the answer you got, thanks.
Looks like C to me.
Draw a line and locate points P and Q.
Now, note that R can be on either side of P.