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OpenStudy (anonymous):

the speed of three trains are in the ratio 2:3:4. the ratio between the time taken by these train between two stations from St. Louis to Chicago will be? a-2:3:5 b-4:3:1 c-4:3:5 d-6:4:3

OpenStudy (anonymous):

velocity is inversely proportional to time so, the ratio is 4:3:2

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