Question 176494
In a tall office building, one elevator leaves the third floor and ascends at a speed of 2 floors per second. Another elevator leaves the 59th floor at exactly the same moment and descends at a speed of 2 floors per second. If the two elevators do not stop, how long will it take them to pass each other? At what floor will the elvators pass each other? 
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Ascending DATA:
rate = 2 fpsecond ; distance = x floors ; time = d/r = x/2 seconds
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Decending DATA:
rate = 2 fpsecond ; distance = (56-x) floors ; time = d/r = (56-x)/2 seconds

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Equation:
time = time
x/2 = (56-x)/2
x = 56-x
2x = 56
x = 28 (# of floors each elemator moves)
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Ascending: 3 + 28 = 31st floor
Decending: 59- 28 = 31st floor
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Cheers,
Stan H.