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OpenStudy (anonymous):
a train, x meters long, traveling at a constant speed, takes 20 seconds from the time it enters a tunnel 300 meters long until the time it completely emerges from the tunnel. one of the stationary ceiling lights in the tunnel is directly above the train for 10 seconds. find x
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OpenStudy (loser66):
@dan815
OpenStudy (dan815):
|dw:1381032535840:dw|
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