SOLUTION: 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? Which equation ca

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Question 1015969: 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?
Which equation can be used to solve for t, the time it takes the planes to be 1,000 miles apart?
A)280t + 320t = 1,000
B)320t - 280t = 1,000
or
C)280 + 320 = 1,000t
Found 2 solutions by FrankM, fractalier:
Answer by FrankM(1040) About Me  (Show Source):
You can put this solution on YOUR website!
A is correct.
You see why. Time * M/H gives us miles. And the miles add to 1000.

Answer by fractalier(6550) About Me  (Show Source):
You can put this solution on YOUR website!
Rate times time equals distance...or rt = d...
Your would have to add the distances each flies to find out when they will be 1000 miles apart...only choice A makes any sense here.