78. "Just you wait!"-the wolf growled, noticing the hare 30 m away, he rushed after it when it had 250 m left to reach its hiding place. Will the wolf catch the hare if he runs 600 m per minute, while the hare runs 550 m per minute?
78. The hare will run 250 m in $\frac{5}{11}$ min $\left(250: 550=\frac{5}{11}\right)$, while the wolf needs to run 280 m $(250+30=280)$ to reach the hiding place, which will take $\frac{7}{15}$ min $\left(280: 600=\frac{7}{15}\right)$. Let's compare $\frac{5}{11}$ and $\frac{7}{15}$. Since $\frac{5}{11}=\frac{75}{165} ; \frac{7}{15}=\frac{77}{165}$ and $\frac{77}{165}>\frac{75}{165}$, the wolf will not catch the hare.