2. Buratino accurately calculated the time and left Papa Carlo's house at 13:40 to arrive at the Field of Wonders and plant 4 soldi exactly at sunset. If he had walked 25% faster, he would have arrived at the Field of Wonders 1.5 hours earlier and waited. At what time did Buratino arrive at the Field of Wonders?
Solution. Since the distance is the same in both cases, and the speed is $\frac{5}{4}$ times greater (25%), the time spent will be $\frac{5}{4}$ times less. We get the equation $\frac{4}{5} t=t-\frac{3}{2} \Rightarrow t=7.5$ hours. Therefore, Buratino arrived at the Field of Wonders at $21:10$.

Answer 21:10.

## Grading Criteria.

Correct answer obtained with justification - 7 points.

Time of travel obtained with justification, but the question of the problem is not answered - $\mathbf{5}$ points.

Properly derived time ratio - 1 point.

Correct equation (mathematical model) derived with justification, but no further significant progress - 3 points.

Solution is incorrect or only the answer - $\mathbf{0}$ points.

## MATHEMATICS  8th GRADE