Question 73154: One plane departed from NY and, at the same time, another plane departed from Mexico City. They flew towards each other at rates of 650 mph and 550 mph. If NY and Mexico City are 3,000 miles apart, in how many hours did the planes pass each other?
Found 2 solutions by diluzion, Adam:
Answer by diluzion(5)   (Show Source):
You can put this solution on YOUR website! My opinion with a logical perception that is very simplyfied to "metaphors":
The grammer is a bit 'distorted', and i perceived it as comprehension errors otherwise this could also be a very simple way to solve problems.
Laziness was the dilemma why i answered in this way via: ["had read 'and, at' = I Didn't understand when i was taught in my primary years that commas cannot be placed after the word "and".
Exampled correction may equal the following:
- "i robbed the bank taking the passwords, this might of been a dream though and this is a made-up story"
- The comma is after 'passwords' and the "&" is located when the final sector of items is spoken about via: the expression of completely changing the subject when the quoted was presented.
Answer by Adam(64) (Show Source):
You can put this solution on YOUR website! The most important thing to realize in this type of problem, where two objects are heading towards each other is that they started moving at the same time, so when they are passing each other, they were moving for same time. We say t1=t2. We also know that  which can be rewritten as  . In our case are able to construct these equations:
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v1*t = s1
v2*t = s2
s1+s2 = 3000
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We can subsitute v1*t and v2*t into s1+s2, so it becomes v1*t+v2*t=3000
650*t+550*t = 3000
1200*t = 3000
t = 3000/1200
t = 2.5 hours
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