SOLUTION: GRE Question: NY is 3000 miles from LA, S leaves NY heading towards LA at the same time, R leaves LA heading towards NY. If S is moving at 200 mph and R is moving at 400 mph, how s

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Question 878751: GRE Question: NY is 3000 miles from LA, S leaves NY heading towards LA at the same time, R leaves LA heading towards NY. If S is moving at 200 mph and R is moving at 400 mph, how soon will one pass another?
Can u tell me what is constant here, the time cannot be constant, the distance is constant, the speed is not constant. Forgotten how to solve this!
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
t = t = D/r
d%2F%28400mph%29+=+%283000-d%29%2F%28200mph%29
600d = 400*3000
d = 400*3000/600 = 2000
2000mi%2F400mph = 5hr, time before they pass one another