Question

What is the distance between city B and city C?
I. The distance between city A and city B is 700 km.
II. The distance between city A and City C is 900 km.

Answer 1

900-700=200 km is right answer

Answer 2

given distance between A and C is 900 and between A and B is 700
let us think of it as a line
so AC = AB+BC
900=700+BC
So BC = 900-700 = 200km