Question 192300
Suppose that in x hours the distance between the two planes will be 1625 miles.

In x hours, the distance traveled by each plane is:
Plane 1: 400x
Plane 2: 250x

The total distance covered is 400x + 250x.

Setting it equal to 1625, we have
400x + 250x = 1625
Solving for x, we have
650x = 1625
x= 2.5 hours