SOLUTION: I have home-schol curriculum and no text books. My problem is this: At 10:00 am two planes leave an airport. If the northbound plane flies 280mph and the southbound plane at 320mp

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You can use the distance formula for this problem:
where:
d = distance traveled, r = rate of travel (speed) and t = time of travel.
For the north-bound plane:
1) r1 = 280 mph
For the south-bound plane:
2) r2 = 320 mph
You want the sum of the distances (d1 + d2) to equal 1,000 miles.
From equation 1) you get:

From equation 2) you get:

Add the two d's.
Simplify and solve for t.
Divide both sides of the equation by 600

hours.
t = 1 hour and 40 minutes.