Two cars leave town at the same time going in opposite directions. one travels at 70 mi/h and the other at 55 mi/h. in how many hours will they be 250 miles apart?

I think its 17 hours

Use this correlation distance-time-speed to find the answer
d = vt
d stands for distance, v stands for speed/velocity, t stands for time

The sum of the distance must be 250 miles, so they could be 250 miles apart.
The time must be the same for the two cars.
distance 1 + distance 2 = 250
v₁t + v₂t = 250
70t + 55t = 250
125t = 250
t = 250/125
t = 2

They will be 250 miles apart in 2 hours

No solution : there is no number of boxes that she bought

Bis the correct answer