The distance traveled by Davis family = 35 miles
Time taken to cover the distance =
hour
Speed = Distance
Time
Speed =

Speed =

So, speed = 70 miles/hour.
At 2:00 pm, the family destination was 245 miles away.
So, the number of hours, when the family was 245 miles away =

= 3.5 hours
So, after 3.5 hours, that is at 5:30 pm, the Davis family will be 245 miles away.