4.1. From cities $A$ and $Б$, which are 240 km apart, two cars set off towards each other simultaneously at speeds of 60 km/h and 80 km/h. At what distance from point $C$, located halfway between $A$ and $Б$, will the cars meet? Give the answer in kilometers, rounding to the nearest hundredth if necessary.

## $\{17.14\}$
Solution. Time until meeting $=240 /(60+80)=12 / 7$ hours. In this time, the first car will travel $60 \cdot 12 / 7=720 / 7$ km. The required distance $=$ $120-60 \cdot 12 / 7=120 \cdot(1-6 / 7)=120 / 7 \approx 17.1428 \ldots$ (km).