conversations.from: human
conversations.value: Peter knows that the distance an airplane travels between Spain and Russia is 7019 km, while the distance between Spain and Germany is 1615 km. Peter took a flight from Spain, which made a stopover in Germany, while being there, he receives a call from his brother asking him how many kilometers he has to fly to get to Russia and then return to Spain.  What will Peter answer?
conversations.from: assistant
conversations.value: Being 7019 km the distance from Spain to Russia. To get from Germany to Russia, Peter has to travel 7019 - 1615 = 5404 km
  Knowing both distances, Peter will answer that he has to fly 5404 + 7019 = 12423 km