Multiple choice general knowledge math & puzzles

A child went 90 m in the East to look for his father, then he turned right and went 20 m. After this he turned right and after going 30 m he reached to his uncle's house. His father was not there. From there he went 100 m to his north and met his father from the starting point?

  1. 80 m

  2. 100 m

  3. 140 m

  4. 260 m

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Using the Pythagorean theorem: the child moves 90m East, then 20m South, then 30m West (leaving him 60m East of start). He then goes 100m North (placing him 80m North of start). The distance from start is sqrt(60^2 + 80^2) = 100m.