SOLUTION: Please help me figure this out. I have tried but I'm still not sure how to do it. At 10:00 a.m. two planes leave an airport. If the northbound plane flies at 280 mph and the sou

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Question 236238: Please help me figure this out. I have tried but I'm still not sure how to do it.
At 10:00 a.m. two planes leave an airport. If the northbound plane flies at 280 mph and the southbound at 320 mph, at what time will they be 1,000 miles apart?

Answer by checkley77(12844) About Me  (Show Source):
You can put this solution on YOUR website!
280t+320t=1,000
600t=1,000
t=1,000/600
t=1.667 hours or 1 hr. & 40 min. they will be 1,000 miles apart.
10:00+1:40=11:40 is the time.