SOLUTION: A plane leaves Charlotte at 9:00 AM and flies north at 400 knots. At the same time, another plane flies south from Charlotte at 250 knots. How long is it before they are 1000 nauti

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Question 1196175: A plane leaves Charlotte at 9:00 AM and flies north at 400 knots. At the same time, another plane flies south from Charlotte at 250 knots. How long is it before they are 1000 nautical miles apart?
Found 2 solutions by Alan3354, ikleyn:
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
A plane leaves Charlotte at 9:00 AM and flies north at 400 knots. At- the same time, another plane flies south from Charlotte at 250 knots. How long is it before they are 1000 nautical miles apart?
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The speeds are added when going in opposite directions ---> 650 knots
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d = r*t
t = d/r = 1000/650 hours

Answer by ikleyn(52879) About Me  (Show Source):
You can put this solution on YOUR website!
.

In this problem, pointing the departure time is excessive and unnecessary information.

When writing math problems, it is not customary to give unnecessary information.
Otherwise, it makes the impression of unprofessionalism.


In Math, it is only possible, when you write a joking problem, which is not the case with your post.