Two planes left Seattle at the same time, both traveling due east. One had the rate of 185 mi/h and the other had a rate of 225 mi/hr. After how many hours were they 220 miles apart?

The answer is the same whether you post once or twice or more.

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To find out how many hours it took for the two planes to be 220 miles apart, we can set up an equation.

First, let's establish that time is the same for both planes, so we'll call it "t" hours.

The distance traveled by the plane traveling at a rate of 185 mi/h is given by: distance1 = 185t.

Similarly, the distance traveled by the plane traveling at a rate of 225 mi/h is given by: distance2 = 225t.

We want to find the time it takes for the planes to be 220 miles apart. So, we want to find the value of "t" that makes distance1 - distance2 = 220:

185t - 225t = 220.

To solve this equation, we can simplify it by combining like terms:

-40t = 220.

Now, divide both sides of the equation by -40 to isolate "t":

t = 220 / -40.

This gives us:

t = -5.5.

Since time cannot be negative, we disregard this negative value.

Therefore, the two planes were 220 miles apart after 5.5 hours.