She pulled out her phone and quietly searched for the online solution guide. The screen glowed with the familiar layout of the textbook. There it was: Problem 14. She scrolled down, ready to copy the numbers, but then she paused. The site didn't just give the answer; it showed a diagram of the trains moving toward each other.
Masha stared at Problem No. 14 on page 42. It was a multi-step monster involving three trains, two stations, and a very confusing amount of coal. She pulled out her phone and quietly searched
When the teacher, Vera Ivanovna, walked by, she tapped Masha’s notebook. "Good work on the diagram, Masha. Most students just guess, but you’re seeing the logic." ready to copy the numbers