Hello!

The formula for an average speed is a distance travelled divided by a time spent,

`V=d/t.`

In our problem the average speed `V` and the distance `d` are given, and we are looking for the time `t.` It is simple to find it:

`t=d/V.`

In numbers it is `(350km)/(80 (km)/h)=` **4.375 hours**, or **4 hours and 22.5 minutes**.

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