Question

A person travel 12 km north then 15km east after that 15km west then 18km south how far he is starting point

Answer 1

18-12 ( 15 km to east and back again 15 km so it's will be 0 km distance)
= 6 km will be ur answer

Answer 2

let O be the starting point and P, Q and R the positions after every movement.

Hence, Distance from the starting point =

Distance of final position R from O = OR = 18 – 12 = 6 km.