Let the two mathematicians be and . Consider plotting the times that they are on break on a coordinate plane and shading in the places where they would be there at the same time as such:
Hayaan ang dalawang mathematicians ay at . Isaalang-alang ang pangbalangkas beses na sila sa break sa isang coordinate eroplano at pagtatabing sa mga lugar kung saan sila ay may sabay na tulad ng: