"Petya," she whispered, leaning toward her neighbor. "Do you have the answer?"
"Wait," Masha muttered. She turned back to her own blank paper. She didn't copy the answer. Instead, she drew two little rectangles with steam coming out of them. She calculated the velocity, subtracted the overlap, and— click —the final number appeared in her head before she even saw it on the screen. "Petya," she whispered, leaning toward her neighbor
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. She didn't copy the answer
Masha smiled, closing the online tab. The reshebnik had been her map, but she realized she still had to walk the path herself to get anywhere. She pulled out her phone and quietly searched
The classroom was unusually quiet for a Tuesday morning, save for the rhythmic thump-thump of Masha’s sneaker against her desk leg. On her desk lay the formidable "Mathematics, 4th Grade" textbook by Moro, Part 1.