Two trains start at the same moment from stations P and Q towards each other. After meeting, the first train takes 16 hours to reach Q and the second takes 9 hours to reach P. What is the ratio of their speeds (first : second)?
Correct answer C. 3 : 4
Explanation
Using S1 : S2 = √(t2) : √(t1) = √9 : √16, the ratio of speeds is 3 : 4. The train that takes longer after meeting is the slower one.
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