SOLUTION: Two jets leave an airportat noon, one flying north at r mi/h, and the other flying south at twicce that speed. After 3 h, how far apart are these planes?
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Question 496940: Two jets leave an airportat noon, one flying north at r mi/h, and the other flying south at twicce that speed. After 3 h, how far apart are these planes?
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
Moving in opposite directions means their speeds are added.
r + 2r = 3r
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d = rt
d = 3r*3
d = 9r miles
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