## Task 5

For the laying of a $6 \mathrm{~km}$ long gas pipeline, 40 days are scheduled. Each day, an equal length of the pipeline is completed.

How many $\mathrm{m}$ are still to be laid after the 30th day.
On day 30, $4.5 \mathrm{~km}$ have been laid, so there are still $1500 \mathrm{~m}$ to be laid.

The solution can be approached in various ways, including with the help of a sketch.

### 13.15 26th Olympiad 1988

### 13.15.1 1st Round 1988, Class 4