# Task No. 8.1

## Condition:

Postman Pechkin thinks that his watch is 10 minutes slow, but in reality, it is 20 minutes fast. He agreed with Uncle Fyodor to meet at the post office at $12:00$, and then called and said that he wouldn't make it on time and would be 17 minutes late. At what time will Pechkin actually arrive for the meeting?
Write the answer in the format HH:MM.

Answer: $11:47$

Exact match of the answer -1 point

## Solution.

Since Pechkin's clock is 20 minutes fast, but he thinks it is 10 minutes slow, he adds half an hour to any actual time. Thus, at 11:30, Pechkin thinks it is already 12:00.

Accordingly, thinking that he is 17 minutes late, he will arrive not half an hour early, but $30-17=13$ minutes early.