Problem 4. Tamarа walked down the street and greeted Sasha, who was standing on the sidewalk. After walking $30 \mathrm{~m}$, Sasha started chasing her. After how many steps will Sasha catch up with Tamarа, if the length of Sasha's step is $85 \mathrm{~cm}$, and the length of Tamarа's step is $75 \mathrm{~cm}$? Explain your answer!
Solution. With each step Sasha catches up to Tamara by $85-75=10 \mathrm{~cm}$. Tamara's advantage is $30 \cdot 100=3000 \mathrm{~cm}$. Sasha will catch up to Tamara after $3000: 10=300$ steps.