1. A train on average travels $357 \mathrm{~km} \mathrm{u}$ in three hours. How long does the journey take if the train travels $2023 \mathrm{~km}$ at the same average speed with one stop of 3 hours and 50 minutes and seven shorter stops of 10 minutes each?
1. A train on average travels $357 \mathrm{~km} \mathrm{u}$ in three hours. How long does the journey take if the train travels $2023 \mathrm{~km}$ at the same average speed with one stop of 3 hours and 50 minutes and seven shorter stops of 10 minutes each?

## Solution.

$357: 3=119$

1 POINT

The train travels $119 \mathrm{~km}$ in 1 hour.

$2023: 119=17$ hours

If the train travels at this average speed of $119 \mathrm{~km}$ per hour for $2023 \mathrm{~km}$, it will take 17 hours.

Seven shorter stops of 10 minutes each total

$7 \cdot 10 \mathrm{~min}=70 \mathrm{~min}$.

1 POINT

Convert the total stop time into hours and add it to the stop time in hours:

$70 \mathrm{~min}+50 \mathrm{~min}=120 \mathrm{~min}=2$ hours

1 POINT

3 hours + 2 hours $=5$ hours

1 POINT

Add the travel time and the stop time:

the journey takes $17+5=22$ hours.

1 POINT

TOTAL 6 POINTS